Constabulary

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The SD28 is a way cool (needle feed) machine but is also way outdated.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 Maybe there were smaller sizes available but again, this machine is way outdated and rather used by hobbyists than by professional boot makers nowadays.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.

I would also check the needle bar height (needle - hook timing). Could be that you have to lower the needle bar a tiny bit maybe just 1/4 - 1/2mm

You can sew with 1 needle on a double needle machine but that can only be a compromise cause you are limited to 1 single foot that matches the needle space (different needle spaces require complete new gauge sets for each needle space). You can modify a 2nd foot but that still is a compromise and IMO not ideal if you want to use this machine for a longer time.

The thread post / tension unit on your machine seems not to be the original part. Looks like someone replaced it with home made parts. Usually there is a hole on the underside of the bulge where the threaded post is mounted. The original post can be hammered out for the underside with a pin punch. So I`m not sure what the former owner did - maybe he tapped a thread into the bulge....

First thing you have to ask your self is if you really need a double needle machine for your projects. When you know you will barely sew double seams better buy a single needle machine. I´m barely using my 212 cause most of my work does not require a double seam. I just have this machine cause it was fairly cheap back then so I just keep it. I just have the head not the whole setup (swapping the sewing machine heads in the table). I`m mainly sewing canvas and similar. I do not recall what the original needle system was for the 212 but mine is setup for 135x17 or 13x16 for leather (same needle just different needle tips).

is it completely broke or do you just need some bits? I would assume that Weaver leather can help you.

That is not a sleeve the face plate is one piece of cast iron. When you have all pieces of the tension unit incl the spring rest then I think the cracked piece is not really an issue. the above pic comes from this thread: https://leatherworker.net/forum/topic/109757-move-along-and-save-or-maybe-take-a-risk/ EDIT: noticed it is a picture from your thread anyway

Or add a speed reducer. That slows down the speed when you start sewing and increases torque. I have speed reducers on all my machines. I have digital servos and stepper motors (you don´t have them in the US AFAIK or at least they are not wide spread). On my side of the pond (Germany) they are called "Anlasser Motor". Speed reducers add a lot of comfort IMO. Just my 2 cents. Forum search for speed reducer via Google - just to give you an idea https://www.google.com/search?client=firefox-b-d&q=speed+reducer+site%3Aleatherworker.net%2Fforum

Indeed!!!

Assuming a mixture of Pfaff 28 and Singer 17 which are the same class of sewing machine and they even share the same hook (among others like Adler 48, Seiko TE-6 / TF-6 and so forth). I´m almost certain that if it is a Necchi it will use the same hook as the above mentioned machines: https://www.ebay.com/itm/142912990618 at that price IMO it is worth giving it a try.