AlZilla

12 year old post, but @BearManappears to check in still. Maybe tagging him will draw his attention.

Yeah, servo motors and their controllers are the Mysterious Black Box of sewing machines. They're all just different enough that most don't dare mix n match components and the manufacturers give us just enough information to operate them. I'm surprised the electronic tinkerer crowd hasn't started dissecting these things. I've seen them being retrofitted to lathes and drill presses.

Top/Right of the bottom pic - Looks like if you set Parameter N.G. to "On" and turn the box off and back on, it restores the factory settings. No idea if it will help, but it can't hurt.

See if there's an option to reset it to factory settings. One one of mine I recently noticed an option to hold down two buttons for so many seconds to reset the box. That's all I've got. EDIT: Actually there's an option for it right there at the top of the 2nd pic.

Oh yeah, it'll be harder to sew. But it's fairly thin leather. You could pre-punch the holes with an awl

I'll endorse Fred's answer. From experience, the hotter the water, the harder the end product will be. If you have plenty of leather, it might be worth experimenting with a range between hot tap water and boiling water. I think the hot water trick played/plays a role in making leather armor.

Unfortunately, the "W" series serial numbers aren't well documented. All we can tell is that it was made in 1943 or 1944. Meaning that it might have seen military service since everyone was pretty well focused on war time production. https://ismacs.net/singer_sewing_machine_company/serial-numbers/singer-w-series-serial-numbers.html

One thing that may be of help ... I've found soaking veg tan in hot water and letting it dry makes a stiffer dry piece than room temp water. This was about 10 ounce leather but might be worth a shot. Vacuum sealing the pieces for about a half hour seemed to make them even stiffer. Just a seal-a-meal. The bags have a textured inside, which showed up on the leather.

The pics I've seen of these in use shows them on the side at 3:00 ish. I've carried at 12:00 quite nicely with things like a Glock 33 and down. But now that I've gone to suspenders I have to tuck my shirt in. Definitely don't like "tuckable" iwb. So, I'm looking around. I'm trying to imagine suspenders that attach at the side and incorporate a holster.

I was hopeful ...

Well, here's over a hundred references, maybe the answer is buried in there. Were it me, I'd let the buyer decide for him/her self so I don't get blamed for any problems. https://leatherworker.net/forum/search/?q="Singer 29k71"&quick=1&updated_after=any&sortby=relevancy

If you've already spent the time to research prices you're comfortable with, maybe you could use them here? Let's let BossLady weigh in since I tagged her.

Oh, yeah, I remember this from the stitching question. Very nice. I thought that belt loop was odd but didn't make the connection. No, I've been spending my time tearing servo motors apart. We're also on the tail end of a heat wave and no a/c in my craft room. I definitely need to pick a gun and get on this. Maybe my PK380 would be a good candidate.

Man, you have you a massive amount of work into this. The challenge is that we normally want prices but this is kind a different situation. Let's tag the BossLady in here and see what she thinks, I'm sure it's happened before. @Johanna?

Here's a manual that says the foot rises 3/8" of an inch, so less then that: https://leatherworker.net/forum/applications/core/interface/file/attachment.php?id=149218

You should look at some of this guys posts. He's an experienced leather crafter who has recently done some projects with minimal tools. I don't know that he's created a list but I think a person could extrapolate a list from his projects. Click on his user name to get to his profile page from which you can see his posts. I'm no good at making lists like this. EDIT: here's the post I was looking for. He basically started from scratch:

@Aiden3416, you need to review the Marketplace Rules https://leatherworker.net/forum/forum/71-items-for-sale/#elForumRules And bring this ad into compliance quickly, please. We need pics, location, a price, condition, shipping info and whatever else is applicable. I can't even tell if you have 1 machine or a hundred.

Where is that "Like" button? Thinking about it, a person could do this on any machine they work on regularly, just set an easily seen mark on the bed of the machine. Thank you for that.

I'm afraid you know as much as I do about it. The hardware store probably has a variety of products available. I definitely like the way he used his skiving knife for precise cuts.

For some reason today I watched this bag making video. Maybe these are common practices. I thought it was interesting that he made several subassemblies with double sided tape and glue before he got near any sewing. I'll be looking to incorporate this into my own process. It just never occurred to me, though I suppose I've seen it in a smaller scale. Also the way he edge guides as much as he can. I just haven't embraced the edge guide that much.

Personally, I haven't a clue. Just go to the top and click "Activity", scroll through everything.

Pictures, front and back, are definitely needed. Some of that old gun leather can be worth a few bucks, more often under $40. @Rednichols hasn't been here in quite a while, but maybe this tag will send him an email and he'll chime in. Need to get pics up soon! If Red happens by, he'll know exactly what you have.

I still need to get pictures posted but I can report SUCCESS repairing this motor! I replaced both bearings and it sounds fine now. Very easy job with a small gear/bearing puller. The bearings seat against a stop on the shaft, so zero worry about getting them back in position. I'll say that getting the case back together correctly takes patience and a gentle touch. Each end is very tightly fitted to the case. It takes very gentle tapping to get them seated all the way and then slowly tightening the 4 screws on each end in a repeated cross pattern. I believe that part of my original noise was from the case being misaligned due to the beating it took in transit. I wouldn't hesitate to do this job again.

I think some closer up pictures of that machine would be interesting. The text on the first pic didn't turn out well, but I think if you blow it up, there may be a walking foot back there

Since we're talking about stitching, I wonder why a few random stitches on the lower part of the loop have bottom thread peeking through. But not the top part. I wonder if something on the machine is slightly misadjusted. Almost like the tension drops away for 1 stitch. Maybe something about making a sweep in one direction and not the other?