I’d have no idea how to approach that
I will go and find a gear then give them a call.
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Things you never thought you’d ever hear Penance say… 
Pulled a mech out of a spare vrds 7 last night. Will try and get in touch with gear company later.
There is a thread on diyaudio about someone printing them, but it has gone quiet.
I could model it in openscad fairly easily with a good drawing number of teeth, teeth pitch etc.
Shapeways should be fairly cheap so may be worth a go.
Okydoky. Will remove the gear and stick in the post with your foot.