Quote Originally Posted by Jonathan View Post
This discussion is getting dangerously close to this design:

Rapid Changer

I made a prototype of that just to test the mechanism, but a bit bigger. It holds the holder reasonably well, but since it was only a test I used a random grade of steel which didn't harden much and I didn't grind it. I think it could work, but I doubt the holding force and torque transmission would be that great.

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I bought some EN19 steel to have a go at making a proper one...
Hey Jonathan, How did you heat the items up for hardening? I only ask since I did some hardening with a blow torch and it was OK but i did some in the furnace and OMG what a difference, as much in common as sun and rain.