AlZilla

How about a Russian Trooper Hat? https://www.glacierwear.com/gray-fox-fur-russian-trooper-style-hat.html I grabbed one of the pics so if the link disappears, this will still have a picture.

This post has a manual supposedly for it: Looks like you made a great score.

This thread is about adjusting the walking feet. Uwe has a video posted and his stuff is usually pretty detailed. Maybe this will give you some food for thought until someone swoops in with the answer.

Can you run it with the door open?

Got it. I was picturing this thing laying flat on a table. Now I see where you're going. Also - special blades for plexi ... ?! Cool. I might revisit making plexiglass patterns.

Here's a little overview. Nothing about the attachment but a neat little video. https://m.youtube.com/watch?v=2_TnDQLBZ2U

Well, put it on Etsy, throw a lot of luxury language and pictures around it and see what happens. Alternatively, fish it past an established small shop already selling luxury items. Commit to making no more than 100 of this exclusive design and stamp a serial number on it.

BUSM (not BUSMC) Pilot. It took a little rabbit trailing to figure out what this one was. British United Shoe Machinery. Interesting old machine but I'm unlikely to ever run across one in America.

TLDR: Double check that you found all the oiling points. I was thinking about this and recalled when I first started playing with sewing machines. I had an old Class 15 Singer with a "tight spot" when I rolled it by hand and a small noise when running. Oil-wait-turn, oil-wait-turn. 'Wasn't getting any better. Back to the drawing board. Turned out that I had missed the internal part of the stitch regulator.

So, I'm going to commit heresy. I've had time to ponder this while spending about 8 hours hand stitching a project. Here I go ... I don't believe that the saddle stitch is any "stronger" than the lock stitch. We often see it said, but I just don't see any reason for it. Hear me out - any given stitch length is the same whether it's locked by machine, or a hand sewn saddle stitch. If the thread is the same, the strength is equal. Each stitch line has the same number of stitches and, thus the same length of thread. The bottom thread on a saddle stitch goes all the way to the other side. The bottom thread on the lock stitch goes half way, thens around and goes half way back. So, everything is equal. I can see the argument that if I break one side of a saddle stirch, I still have the 2nd thread running end to end. That's not "strength", it's durability. I'm willing to be wrong.

We'll often use a stick as a stethoscope when trying to isolate strange sounds on a piece of running equipment. Maybe a dowel rod to your ear and touch different areas of the machine? Possibly you could at least track it down to left/right/top/bottom ...

Kind of like the Sistine Chapel.

A belt sander is effective. Bench mount, not hand held. Maybe just the blade, out of the plane body?

That's a big project. I like working with rough lumber, slabs, etc. Way back in about 7th grade wood shop, we basically started from scratch like that. Much more satisfying than just buying some piece of lumber ready to go. That giant quilt pattern is fun. I'm waiting to see what you use for the centers of the blocks. The couple I've done were smaller and the tool I used is the Seeder (I think). Too small to look right on that larger pattern.

Look closely. I seem to recall that some of these binding machines don't have a regular drop feed motion, but instead the feed dogs just just go front to back. I don't know why this is advantageous for binding.