That's a good price for the chuck, cheaper than the one I purchased from Arc Euro, even allowing for the shipping charges.

I think I've worked out a way to couple the chuck shaft to the motor, using a small Lovejoy coupling. The only problem I can foresee is vibration if I can't get everything perfectly aligned.

BTW, the motor I have ordered is this one: http://tinyurl.com/5dcho4, which was $30.16.

The speed controller is this one: http://tinyurl.com/5l8ols, which was $11.30.

I've used these RC electric motors in other projects and found them to be quite amazing, they will deliver lots of power with an excellent overall efficiency. Best of all, they are cheap and have no brushes etc to wear out.

Having seen those collet prices on that CTC eBay shop, I'm now tempted to do what I originally planned and replace my clunky old Clarkson with an ER25 set-up.

Jeremy