CowboyBob

It's a roller foot put this on when sewing leather for more even stitches.

Yes,they will work.

This is a Chinese copy of a Singer 81-10 serger,3-spool auto-lube.Around 1995 here in the states YMC used to bring these in & they were not a quality machine this one might of been $95.00 cost for the head.

@rac1812 Slightly loosen the 2 screws on the small hook gear & see if you can get the hook to lower,if it won't move down you could grind out the slot on the bottom of the needle plateTry to increase the size of the slot from front to back(grind on the front side) & try not to take any metal off of the top of the slot.

@rac1812 When you 1st start sewing do you hold onto the needle thread for the 1st 3-stitches?

Yes,they interchange,someone with a broken casting would be interested in the shell BUT it might take a while to sell it.

We'll need more info like what stand,motor, reducer & a pic wouldn't hurt to see the condition.

The 331 is similar to a 335 in the fact the feed dog doesn't lift the material off of the needle plate when it goes back.This creates alot of drag esp in sticky materials like vinyl & leather & will cause the length to shorten.You could have some worn feed parts,lift the foot up & push the needlebar front to back & try the feed dog too to see if there's any play. The 331 a needlefeed & looks like the 335.

@WizcraftsIt will help your foot lift if you grind alittle off of the top of the foot(the comes in contact when the regulator is all the way down) so it doesn't hit the stitch regulator.

He'll need a machine alot heavier than this one to sew tack,all this can sew as long as it's not dried out would be 5/16"

As long as the Adler has the rubber timing belt it would be a better choice w/reverse & the handwheel is larger & it will run slower than the 211.And would sew 138 easier than the 211.

Hey Bob ,I just got the samples you sent , they fit & work great!

As chisel said get the tab of the bobbincase under the groove of the needle plate & also when you stop & want to pull out your material make sure the take up lever is all the way @ it's highest position.

@Hickenbottom Are you sure the handwheel is turning towards you?

Looks like a great idea!

Sorry to hear this.He will be missed!

@wyattuphaus Sounds like you might have something caught in the shuttle,take it out & clean it & re-install & oil the groove it rides in & report back.

In the pic above it looks like the point of the hook isn't close enough to the needle.And once in a while the needle hole in the needlebar gets elongated (on the leftside)from repetitive tightening of the needle . I've seen where the needle actually looks crooked when tightened if that's not the case here you should loosen the hook saddle & move it to the left..

@groundyThe correct # for the cloth type is #235003(which is hard to find) or #224195 like Constabulary said for the rubber one.

They sew similar materials but the parts don't interchange between them.

If you loosen the needle set screw how far does the needle move left to right?

Thought some of you might like to see which machines compare to each other. Industrial machine comparison chart.pdf

On this machine with #92 thread approx 5/16" or 20 oz of leather.

There's a free classified section for used machines on this site that works good.

We have this screw in stock Singer#200006 17/64 x 24tpi.It's 3/4" long