Mick Walker does very little business these days.
Tony Brancato is a good bet for bevels, and Baines of silverstone may still do bevel stuff.
John at Mdina Italia (
www.mdinaitalia.co.uk) may be able to recommend someone or undertake the work himself now he is back in the uk.
A guy called Richard Bool on the IOM deals in bevel singles parts, and he may know someone there who can do work. Unfortunately I can't find his number, but John at Mdina has it.
btw - you dont want the mille crank cos a plain bearing will need a completely different oil supply to the roller cranks.
[Edited on 5-1-2005 by phil_h]