Constabulary

I guess you mean the stitch length dial knob. I think I have a metal one here, I´ll check that later.... Or do you mean the Zig Zag knob?

how about a screw extractor. not sure if it works but IMO it one of the last options you probably have. There are other model video show just a random one.

if it is not necessary to remove the shaft better leave it where it is. such actions sometime cause more damage on parts that most likely are no longer available. My 2 cents.

post some pictures. I once bought front shaft for my 29K71 restoration from College sewing in the UK and I remember the gear was very tight on the shaft but it worked. But I had the OEM gear.

Please post a good clear picture from front and and back of your machine .

there either is a big thumb screw OR a slotted screw (flush with the lid or a bit deeper) in about the same spot for adjusting the foot pressure. But if you dial in a too low foot pressure the friction between needle and leather may lift your sewing material when the needle bar is rising.

It basically is a modern version of the Singer 45K Parts list an manual can be downloaded here: https://leatherworker.net/forum/topic/104255-neels-saddlery-tension-issue/#findComment-696717

Have you taken apart the press? Maybe the solution is simpler than you think. As I said before I once replaced tool holders with a round long nut. Its a quite simple part. Worth checking I´d say. What is the outer diameter of the tool holder? A.) is a guide screw for the tool holder, the tool holder either has a slot of a flat site where it slides along the screw. B.) is a lock screw for the big brass spindle guide C.) is a spindle guide - all spindle guides I have seen are right threaded so it should go out left. But C could be very tight. EDIT: quote from the text on this website: Presswerkzeuge - GETMORE-SHOP Tools for presses with M6 thread - like many machines from Astor, Stocko, Daudé - can be found under "Tools M6" Have you checked if you can screw in a plain M6 screw?

You are welcome! This sometimes happens when you strip the 29K´s. You are not the first and for sure not the last with this problem. 😉 Have fun with your patcher.

I agree with dikmann - we have a topic her about Singer SV machines:

I meant the shuttle driving lever 😉 but I guess you know what I mean.

quoting my self 😉 When I look at the 1st video I notice that when the roller of the rack driving lever and the inner cam track are to the furthest left you can see the "bulge" of the cam track of the cam pulley - know what I mean? in contrast to that - when I look at my 29K71 cams (almost the same as yours) it seems to me that your cam pulley has been installed incorrectly - rotated by 180° as it seems. When I can see the bulge in the pulley cam my roller is furthest to the right. This is when the roller is furthest to the left: Do you see what I mean?

Have you read the manual? There is an eccentric for adjusting the needle hook timing. Just checking - have you taken off the pulley cam on the right end of the machine that governs the up and down movement of the arm lever which is attached to the needle bar?

BTW - what I figured today is that the A51 ex factory is a "button covering machine". Not sure what you want to do with it but the Co. still exist and maybe worth checking with them: https://www.astor-berning.de/fashion/fashion-maschinen/187/a-51-knopf-ueberziehmaschine

Pictures of my lever press - its fairly a beast compared with "plain spindle presses". I needed an M10 (male) x 1/4 (female) adapter to make it work. Meanwhile I figured this must have been the manufacturer of my press but back then no data were available. https://www.loxx-produkte.de/live/Historie-Unternehmensgeschichte/historie.aspx But I doubt any spare parts are available anymore. Anyway I´have what I need and this thingy will last for ever. I have never seen a 2nd press like this either.