Since my last post, I've found that I can drill the flange relatively easily but fouled up on the motor shaft.

DSCF6534.JPG
DSCF6533.JPG

Initially, my idea was to use the flange fitting as a wheel hub and have a M5 locking pin running through the shaft to secure it. However, in the second photo, you can see that the hole is very close to the end.

After speaking with Alex from the Cracker 'n' Smash team on this one, whilst that hole won't break as I feared, the issue is that my flange is on the wrong way around and the holes I've drilled to put the pin through are too far up the shaft when fitted the other way around so I don't see the motor shaft through the hole in the flange. a couple of recommendations came in the form of taperlock bushes or use a shaft support for linear guide rails (https://www.gearsandsprockets.co.uk/...ails-12mm.html).