Biax replacement Stroke Adjustment Screw

Bought a 7EL off the 'bay and it worked fine for about 20 minutes or so. it locked up and sheared the teeth off the helical gear, Yay! Did some inspection and found that the adjustment screw for stroke length had lost it's castle nut, allowing the screw to back out and bind.
broken screw end in the attached photo where the castle nut has departed.
Does anyone know of a source for a replacement? Anyone have an extra they wouldn't mind parting with?
I can probably make one at work, but it looks like a tiny acme thread, and metric. Anyone have the specs on the thread so I can buy a tap?

I have a replacement phenolic gear on the way but can't find anything about the screw. Part 48 in the snip provided sourced from Vintage Machinery manual (german).
Part 203 001 255
Cheers!

Finding someone with a spare bolt is really a long shot, so you should be preparing yourself to make one. Metric Acme style threads are typically called Trapezoidal "Tr" threads and you should be able to get a die to cut your own. I've seen people modify standard metric threads of the same pitch to fit in Trapezoidal, but I couldn't comment on how effective that might be. From memory, the bolt has a couple of shoulders on each end to keep it aligned in the wobbler housing, you can hopefully pull all those dimensions off of your broken bolt. Lastly, it may be possible to bore the broken bolt and tap it, and use a small loctite fastened M2 or M3 screw to keep it in place. Keep in mind the adjustment tension needs to be pretty high otherwise the adjustment will loosen when using it.

You should probably also check with Ed Dyjak as Rich King often recommends. He has some used replacement parts I expect from basket cases and that's a part that doesn't usually break or wear so should be available.

TGTool said:

You should probably also check with Ed Dyjak as Rich King often recommends. He has some used replacement parts I expect from basket cases and that's a part that doesn't usually break or wear so should be available.

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He is listed on Google - I have an appointment and no time to look it up now. ES Dyjak in Milford MI. It says he is closed, but he is open. If he doesn't have one I know some guys in Austria with a trove of old BIAX parts

Richard King said:

He is listed on Google - I have an appointment and no time to look it up now. ES Dyjak in Milford MI. It says he is closed, but he is open. If he doesn't have one I know some guys in Austria with a trove of old BIAX parts

Click to expand...

left a voicemail for him.