Irishleather

OK, I got it moving everything including the feed dogs. I'm using a needle from my Singer 17-23. I think it might be a good match, it is with the hook, but it is pretty sunk before the teeth go below the plate. So that sounds like a feed adjustment. So far the stiches are aroun 9 to an inch. I am afraid that is too small for leather. Which could put me in search of a post bed with longer stitiches.

I just picked up a Singer 51 W 25, I think. The badge is gone. What I am asking about: I see a lever to the right that I thought would increase the stitch length, and the lever does move a rod along a slide changing, maybe, the feeddog shaft? Not sure what I am looking at yet. Is that what that lever is suppose to do? Also I broke the bobbin case tension spring, thought I could coax it to put pressure on the thread, since completelty tight did not. But, ya, that didn't work. Works on newer stuff. So I hope one is coming from an eBay seller, although it didn't identify that machine. I saw on on here, but nothing that might speak to a similar machine so I can figure out the stitch regulator, if that's what it is. Advice? Beautiful old table! I put pictures in, then thought to choose a better one, now it won't let me load any. lol There they are.

I know a few years have gone by. I am looking to sand and burnish leather, too. But because I work with industrial sewing machines, I wondered if the "servo" motor made for sewing machines would work? like this one? This is shipped by Amazon: https://www.amazon.com/dp/B07XB9D1L6/ref=redir_mobile_desktop?_encoding=UTF8&aaxitk=36db6e8e52797bb897763410eaf47ae6&content-id=amzn1.sym.7e9cd8c2-888c-46c4-82d2-714b2b703021%3Aamzn1.sym.7e9cd8c2-888c-46c4-82d2-714b2b703021&hsa_cr_id=9755496630001&pd_rd_plhdr=t&pd_rd_r=4023fb89-9de5-44a7-8a53-11d5b5a140a7&pd_rd_w=maWQc&pd_rd_wg=CHy7u&qid=1675011135&ref_=sbx_be_s_sparkle_lsi4d_asin_1_img&sr=1-2-9e67e56a-6f64-441f-a281-df67fc737124