Hi Dave,
I have the Allchin bevel gear and pinion drawings. Shown as 24 DP, 60t and 15t resp. Two bevels and 3 pinions.
AFAIK, Reeves stock them.
The pinion pins are 1/4" x 13/16", drilled for oilways then casehardened.
PM me your email address if you wish and I'll try to send a scan.
clive