Constabulary

That seems to the an oil well for the clutch but not for the machine it self.

What do you mean - looks like the bobbin / hook area is open cause I can see the hook driver on picture 2. Pictures are fairly small.... what does the brass tag say? is it 65? If it is a Pfaff 65 then it is a darning machine but not a sewing machine. If the machine is like this (German language website) there is no way to convert it to a 28 cause major parts are missing. F.i. stitch length lever and the rod for driving and lifting the feed dog. But as I said the pictures are very small and do not show the details very well.

You have mixed up the machine Class and the serial number. The G on the serial number is not for Germany. But G for Germany is a suffix of the machine class f.i. 111G156, 211G141. But this only applies for machines made in Germany (in Karlsruhe) after 1954. Machines made in Germany (in Wittenberge, Prussia) until 1945 had a C prefix on the serial number and a D (but not all IIRC) as suffix of the machine class like 45D91, 96D43 and so forth. After WWII until 1954 Singer did not produce sewing machines in Germany. You can get 29K threading wires on Ebay, Amazon, Etsy, Ali Exprsss... for a few bucks Personally I never had problems with 138 thread in any 29K model. They all use the same hooks since for ever. But the size of the needle hole in your needle plate matters. Iif it is too small you may have problems using larger needle and thread sizes. But be aware that the bobbins are fairly small and do not hold much of the 138 thread.

Sorry, I doubt that. What is the serial number incl. prefix and please post pictures from front and rear.

Never have seen this before on a patcher machine. Found this pic a while ago on the web so I cannot provide more details. Seems to be custom made. I don`t think the machine came like this from the factory. Just wanted to share this.

so way way cool How about making the parts from aluminum?

Ebay is your friend - sometimes. Not cheap but he has it: https://www.ebay.de/itm/185107601974 Other than that check with LIERSCH https://liersch.com/ or Zieger https://www.np-z.com/

Singer 211 also came with large hooks depending on the subclass. I think the 666 subclass is a large hook machine.

I would still go with the Singer. I agree with cowboyBob regarding the hand wheel on the 211 (I tried this on my 212 and I had no success) but if you want to change the motor and install a new servo motor you could add a speed reducer to slow down the sewing speed and add more torque. I would check the machines if they have matching forward and reverse stitch length. I know there is a procedure how to adjust F+R stitch length for the Singer 211 and the Adler 167 but I think I have not read anywhere how to do this on a Pfaff 1245 (not saying it is not possible). If the stitch length matters for your projects I think the Adler and the Pfaff have max 6mm and the Singer 5mm.

yeah, looks, cracked and IMO it needs to be replaced. Its doable but not easy. You find some hints here:

its rather a light duty machine for the shoe trade f.i. for sewing shoe uppers. Its not that you cannot sew other things on it but that is what the machine was designed for. The bobbins are fairly small. I have a Singer 18 brochure (see attachment). The Singer 18-3 or Adler 49-2 are quite the same as the Class 18 shown in the brochure with the difference of having wheel feed instead of a feed dog. Let us know what you are planing to sew (material thickness, product....) so I´m sure we can recommend a machine for your needs. Singer 18-22 Broschüre.pdf

Singer 18-3 is the equivalent

I have an early Singer 51w post bed machine (based on a W&W) and the upper section is pretty much the same just a bit shorter. https://leatherworker.net/forum/topic/86292-singer-51w-sv-2-post-bed-machine-restoration/ I have a manual for the 51w and it will work for your machine too. The hook seems to be the same as well so the manual should cover everything. Give me some time and I´ll upload it if the file is not too big... EDIT: well, this one should be even closer 21_w_180.pdf

The SD28 is a way cool (needle feed) machine but is also way outdated. I owned one it I loved it but it is not very... lets say user friendly when it comes to needles and spare parts. And it was not very versatile. It is mainly a sole stitcher so the number of needle sizes of course is (or was) limited to the rather larger sizes like NM 200 and bigger. So do not expect to find 1551 needles in size NM 160 or so. Maybe there were smaller sizes available but again, this machine is way outdated and rather used by hobbyists than by professional boot makers nowadays. The spare parts you find nowadays usually come from broke machines and no new parts are available AFAIK. Well maybe there are some NOS parts that are dug somewhere in the world - you never know but finding them and having them shipped to your door can be an expensive challenge. Times have changed and the sewing machines as well. However - I know there is or was a guy who reproduced needles for the SD28, I think he made them from other needles but I do not know the details... Let me see if I can find more information.... EDIT: Register in this German sewing machine forum and contact the member HENRY LEDER. This is the short thread where he said he makes new needles for the SD28: https://www.naehmaschinentechnik-forum.de/viewtopic.php?t=7059

As I said in an earlier post in this thread. I have two Jack Motors with 750W (563A actually) and they both make this sound. IMO that sound is not really an issue. The oldest is running since 2014 w/o any issues. Really, that "noise" may just sound strange but IMO its actually not an big issue. From what I have witnessed that "noise" is quite common among the "cheaper" 750W motors. IIRC the 550W Jack Servo do not make this "noise". Just my experience.

IIRC you need a spacer between machine body and flywheel to line up the flywheel pulley with the motor pulley. Otherwise you may have too much axial play .

depends on the sub class. which one do you have? 7-10, 7-33 or....

I can´t really help but I heard rumors that JUKI PLC gauge parts could fit but that is just a rumor, I have no proof for that. Maybe worth checking this: https://www.juki.co.jp/industrial_e/products_e/lether_e/postbed_e/detail.php?cd=PLC-1700_E Other than that I would contact KH sew or a local dealer. Maybe KH Sew knows more.... https://www.khsew.com/index.php?route=product/category&path=168_227

Remove the face plate. The needle bar is clamped by 1 screw which is visible from the front. Rotate the hand wheel until you can see it through the hole. See pictures.

How about reading a manual instead of watching videos? www.consew.com/Files/112347/InstructionManuals/18.pdf or here is a Singer 16 manual which is the same machine Singer 16 manual.pdf

That sound IMO is not an issue. I have two JACK Servos with 750W and the earlier one is running since.... have to guess ... since 2014. They both make this sound. I´m not sure but I think more 750w motors make this sound than the 550w motors but I´m not 100% sure.

I now have a Pfaff 23(w/o reverse) manual in German language - send me PM if interested. Other than this look for a Singer 17-16 manual (or similar).

$75 really is not much money and this is a large hook machine and that makes it a really interesting machine. A lot of parts are still available for the 29K60 but not all. The 29K60 has a lot parts in common with the later 29K72 but there are some differences. What I can see in the picture is that the machine at least needs a new shuttle hook + bobbin and a needle plate and its hinge screw. Everything else seems to be there. AFAIK, needle plate is the same as for the 29K72 and the hooks is the same anyway. I`m not sure about the screw for the needle plate (29K72 has a pin instead) but it could be the same as for the Adler 30 machines. 29K60 parts list and and manual are available online for free. If you can´t find em send me a PM.

No video that I know of but needle hook timing is very similar on most drop feed machines - however here is a Singer 17 manual. It also covers the 17-41 Singer 17-22.pdf

Presser feet have to match the feed dog. This is what you find on Ebay https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=foot+pfaff+138&_sacat=0&LH_TitleDesc=0&_odkw=feet+pfaff+138+&_osacat=0 but the known sewing machine dealers may have more variants.