No. 4 Tympan Bar lock plate

Hello Vandercookers… I have two tympan lock bars for a No. 4. No idea of what the real name for these are. They hold the typman to the Reel Rod. Both have one friction pin broken off. I am wondering if anyone has any thoughts on pressing the broken pin out of one, and then pressing the good pin out of the other and back into the bar to make one good one? Any ideas on how to safely doe this? Or do replacement pins exist, and can i just buy a replacement pin and press it in? Thanks

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Eric Holub
1 year ago

That’s a simple make with minimal tools. Get a piece of rod stock, cut to length, chuck it in an electric drill or drill press, spin, and use a half-round file to get the pin profile. It may take a few attempts to get it right. leave enough at the butt end to peen over.
The previous owner of my 325 got a stripped press and had to imaginehow to rebuild it. For the tympan clamp he drilled and tapped the four holes in the reel, made an clamp bar from aluminum strip, and attached it with four screws. Works, but cumbersome.

Last edited 1 year ago by Eric Holub
The Arm
1 year ago

I have one of these with a broken pin too. I am eager to hear if you find a viable solution.


Paul Moxon, Moderator

I’ve searched for these pins and haven’t found anything on the shelf. A machinist can fabricate.

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