Need source for Large M bobbin case for National 306N W.F. machine

[Wizcrafts]

Howdy;

I have a National brand model 306N (Made in Japan) walking foot machine used to sew vinyl and leather. It came with one M size black bobbin case. I usually pre-wind a bunch of bobbins with whatever thread I am going to use on a job and would like to obtain some extra proper bobbin cases for this machine. The bobbins are large M style (1" x 3/8"). The machine has some parts stamped Seiko and is made in Japan. It looks sort of like a Consew 206 series machine. I bought some M bobbin cases on eBay, supposedly compatible with my machine, but they had to be ground down at the upper-left opening, to allow the cases to fit into the shuttle. Also, the thread comes out of the springs in a jerky flow and causes the stitch knots to move up and down.

Apparently, this machine uses a non-standard bobbin case, with a much wider opening on top. This is because the case has to clear two tiny screws on top of the shuttle assembly, about 1/4" apart. The cases I bought do not clear the left screw head and cause the case to jam, unless it's left tab is ground off at the opening on top (which I did, with limited success).

I have posted a group of pictures below to show what the OEM bobbin case and the machine looks like.

Hopefully, somebody here has a similar machine and/or knows where I can get the proper bobbin cases for this machine. If you have some you don't need I'll be happy to buy them from you.

Thanks in advance, Wiz

Edited October 7, 2009 by Wizcrafts

[CowboyBob]

Hello,I used the sell the Nationals & have the correct case for you.

[Cobra Steve]

Hello, the bobbin case is a Consew 206 RB bobbin case and Bob Kovar has it. Thanks, Steve

[Wizcrafts]

Thank you all for your replies. I now have a new bobbin case from Bob Kovar in Toledo! It works perfectly!

I also got a pound of #138 nylon thread from him at a very good price.