Constabulary

The 17U model was made in Japan the 123 subclass has smaller diameter arm compared with other Class 17 machines and it is using Singer 15 type bobbin cases and bobbins. Apart from the hook / bobbin you should be able to use any other 17U model manual you find online. The subclasses usualy just have minor differences but the main machine often is the same. Check if needle plate and feed dog are present and in good order and see that the machine is complete in the hook area - see parts list for that or post more detailed pictures.

the needle plate and feed dog seem to be raised so the machine once was used for edge binging operations. Timing belt 224195 works for all 111w IIRC.

I think the fork is attached to part no 3033 (feed fork connection link) from the rear with a screw (the one which thread you see on your last picture) and the part 3033 is attached to the 6459 (feed regulator = Stitch length adjuster) and to the machine body with a screw and I think this is screw the read arrow is pointing to (see picture below). So I think you have to remove this screw first. The rest is trial and error. I recall it was similar on my Singer 45D91 back then. Look at these parts from the rear side, you should see the parts through the hole. Move the stitch length lever up and down and I think you will notice what I have described. EDIT: I just noticed the video - it shows what I mean.

I once owned a similar machine I stripped mine for parts back then after I found a 132K6 and I do not look back. I think they are not worth upgrading to 132K6 as parts are rare and expensive - IF the upgrade is technically possible at all. But maybe you have luck - dunu. a lot of parts (in general) can be found at College Sewing or Trojan Sewing in the UK or MARFAR in Australia.

my bad - my feed dog is from a 104-64 - sorry. Anyway, your looks normal to me.

does not look worn, it is an oval hole because you can alter the feed doh height I think I have a feed dog to compare I´ll check later today.

I see so it´s the fork. They are attached with 2 screws, one on the lower end and one centered right under the fork end. IIRC the "fork screw" can be reached from a hole under the top shaft bushing behind the hand wheel.

maybe you can post pictures and give us some more detailed information cause no one knows what parts 3037 is except we download a parts list an look through it until we find the part you talk about 😉

see attachment for different leather needles with different cutting points and how their seam appearance is schmetz_db_schneidspitzen_6s_20190510_en(1).pdf

Maybe you can explain what you mean. How thick is the material overall and what needle and thread size are you using and what do you think is "not normal"?

I just received my replacement foot today and it fits w/o problem. Good seller I´d say.

I ordered one of these just out of curiosity. https://de.aliexpress.com/item/1005007232336060.html Price today is 1.49€ and free shipping on orders above 10€. Not sure what price you see on the other side of the pond. They work for cross-wound cones with a 3" / 7.5cm base. Smaller and larger thread cones do not work with this thingy (well, depends on the core diameter which on my cone is approx 1") Could be a workaround and prevents "heavy weight" x-wound thread spools from spinning on the thread pin. That sometimes can cause tension problem. Design could be a little better, IMO it could use a set screw to secure this thingy on the thread pin and the tube should the 3/4" or so longer so it would thick out of the hole on the top of the thread spool but anyway - it works as is but needed a little bending here and there. Not that everybody needs one (there are other "options" too) but its a fairly cheap workaround and could be an improvement. Just wanted to share this. 😉 Some quick pictures:

Cool video. Me as a sewing machine idjit wonders what machine is using these feet shown in minute 0.11 - 0.14. 😗 looks singerish but not 111w feet I´d say.

check if thread keeps hanging on the bobbin case opener

maybe wet binding leather performs better, just a guess

sorry I was wrong, I misinterpreted the picture (have you updated it?), forget piping feet.

Suspended Edge guides are the same as for Juki 563 / Singer 111w and similar machines. https://www.google.com/search?client=firefox-b-d&sca_esv=9a662cfbafe167d5&q=Suspended+Edge+Guide+site:leatherworker.net&source=lnms&fbs=AIIjpHw2KGh6wpocn18KLjPMw8n5Yp8-1M0n6BD6JoVBP_K3fXXvA3S3XGyupmJLMg20um8wiXfIX1WBBCL40ceQNb1f_1RgkIjfpWjyi_Ry0tINHRC7VfioyuPPYs3t5QzRFCOThQJw2G3haEdB8Xf5VpajW4v6ZD1f9ayzixkbllMGhfyZ499gvQpomaFmqZmbpm9styOJPYAf6NRDYd7RbQ6wudZ0GA&sa=X&ved=2ahUKEwiW7pLuw4yRAxX8qP0HHd1qN8UQ0pQJegQIDRAB&biw=1600&bih=721&dpr=1 Other that that you can f.i. use presser feet with edge guides https://www.ebay.de/sch/i.html?_nkw=Edge+Guide+foot+singer+&_sacat=0&_from=R40&_trksid=m570.l1313&LH_TitleDesc=0&_odkw=Edge+Guide+foot&_osacat=0

I guess with piping feet this can be sewn

or the needle bar it set a bit to high. I´d check the whole needle hook timing.

either I haven't noticed it or it has been added lately 😉 no big deal....

that's where certain feet come into play with which you can sew closer to hardware - of course depends on the sewing situation and on your machine but they can be useful. Check the links in this thread:

college sewing in the UK for sure has the parts. I have used them for my 29k71 back then. But the parts where tight and IIRC the shaft had no hole for the tapered pin that holds the bevel gear. But I may have some used parts. Please send em a message. Where are you located?

I may have the parts. Can you send me a list of what in particular you need? Please send me a PM message.

no, it belongs to the machine. See parts diagram I pointed where it does on. The lifting rod I mentioned is not part of the knee lifter.

I´m on the other side of the big pond (the land where the CLAES come from 😉) and yet I only have heard of the "Cowboy Clones" of the 8346 but I have no info when the will be released and how good they will be. I´d say time will tell. I have none but from what I read here they are equal and probably come from the same factory (guessing) just with a different color and name on it. Since you are in NH I´d check with a dealer that is close to you. Toledo Sewing Machines (he is member here too - check out @CowboyBob) is not really close but probably the closest and from what I read they have an excellent reputation so maybe worth checking with them.