Constabulary

No words needed - you pretty much hit a dozen nails with 1 hammer

this can have several reasons - needle not correct insert, hook tip worn, hook timing, position of the needle holder...

WOW - nice cabinet! But can´t see the needle

Brmax - i had to google "Singer Heavy Duty" and the result put a little smile on my face - I guess you will smile too. Interesting what "Singer" considers as heavy duty nowadays - I guess it depends on the point of view - kind of.

Cobra 18 for sure can do the job (up to approx 20oz leather in total) but since you are in PA you may consider a dealer closer to you (may save shipping costs), I´d check with Keystone Sewing or Toledo Sewing Machine Co. Both have a very good reputation here. No one knows how your "stairs situation" is but a fully assembled machine is tough to get up or down stairs - you at least have to take off the head (easy to do). But when you consider shipping you may get the machine disassembled anyway. if you buy form a dealer close to you probably can pick it up by your self.

quite tiny picture but seems someone put an odd plate behind the stitch length lever. Remove the stitch length lever knob then remove the plate and put back on the the knob. Thats at least what I would try. The knob looks a bit odd too but cannot see details very well.

maybe this helps EDIT: sorry - I was to fast, have not checked the PDF 335 H3 Subclass Old C.pdf

Greetings to Denmark from Germany, 1st of all Germany is not the country for buying parts for vintage Singer sewing machines. You probably go nuts before you find something for the 2 machines. Germany is Pfaff and Adler country however parts for vintage machines are hard also to find also. I´m quite a bit vintage Singer crazy and I order 90% of the parts I need form College Sewing in the UK (UK is still a EU member so no Tax and custom fees). I think the Singer 7 is way way way way to heavy for your work. This thing is a monster and great for parachute webbing, sails, heavy tarpaulins and so on. So considering what you want to sew and if you have no other options I´d buy the Singer 132K6. I have a similar machine, a 133K3, its a cylinder arm machine and w/o the upper jump foot but it is the same class. You can easily find parts at College sewing. This machine is still manufactured, not by Singer but by many other companies in China. So the parts situation is excellent! https://www.college-sewing.co.uk/store/Singer132B,132K,133KSewingMachineParts Side Note: You probably have to replace the motor with a modern Servo Motor and probably add a speed reducer to get better control and more torque (if needed).

maybe this one helps you - he has more Chinese patcher videos

for the brownish gunk on the outside of machines try a washing soda solution and a rag. But always be careful with the decals if you want to keep them. I once soaked a patcher machine in a hot washing soda solution and the brown gunk was easy to wipe of but I´d recommend that for complete restorations only

Does not surprise me - with a thin needle and thin thread almost every sewing machine can do that with 3mm leather - thats physics. Guess why the doctors are using thin needles on syringes

Mad electric scientists!

Glen - so sooner or later we can read a japanning 1O1 here, right? It´s indeed an interesting process I´d like to read more about. Where have you sourced the "paint"? Jimi - have I ever mentioned that I hate you for your nice 45K´s?

don´t know the machine but when a valve with a threaded cap is leaking through it´s threading I´d try some loctite or JB weld. At least worth a try when its it shot anyway.

I don´t know what sort of patcher machine that is but it is not a Singer 29K60. I GUESS it is one of these rough Chinese patchers, right? Like this one - see linked thread? If it is the above check with LW Member Darren Brosowski he is selling them.

@ Lumpendoodle - A very nice machine you have!!!! I have some pic of a pre 1945 Singer 45Dxx (not mine) - still very shiny

Thanks Glenn. You always learn something new everyday - I did not expect they switched to metric measures - good to know. With other words - better leave em alone when you find one that (may) needs parts?

GOOD LORD - what a nice bunch of machines. Can I add a Needle Positioning System and has JUKI ever built s clone of them

I´m pretty sure they are since all later 29K´s with replaceable gearbox have a lot in common. I only noticed Singer returned to the simpler and cheaper to produce thread take up lever adjuster at one time but I´m sure most if not all other parts are interchangeable. But to be 100% sure you should compare the spare parts list oft he 29k73 and 29U173U when you are looking for a specific part. Will try to add the files I have for the 29K72 / 29U73A EDIT: I also have a 29K73 PDF parts list + manual but cannot upload and and cannot compress it to a readable size. Send me a PM if you want it 29U171A_172A_173A.pdf Singer 29K - 29U171A_172A_173A.pdf

will try to save that information - thanks Glenn

Maybe the CB3200 from Toledo Sewing is an option - it´s also a walking foot machine and cost way less http://www.tolindsewmach.com/cb3200.html

Just from looking at your picture.... Look for Juki 415 or 555 - they are pretty much the same class - maybe a little bit bit different. I would even guess this one is probably a bit an earlier model.

Forgot to add Nakajima

Mitsubishi - Juki - Seiko - all the same

I think I have seen a Mitsubishi machine that looked the same but I don´t recall the model. However the Techsew 2750 looks similar to it but the Nakajima has no walking foot. http://www.techsew.com/techsew-2750-cylinder-walking-foot-industrial-sewing-machine.html/