As you may already know, I am a junkie for using junk when it comes to making things.
Well, here's another tip using junk (or a new bit if you ain't got one)
I needed to make an Adaptor to marry the Orion Accufocus to the Crayford Focuser shaft.
My solution from the shed was an old Plastic Fuel Filter from a car (I don't throw much out) and I hacked the end of. Both ends are a perfect fit!!!!!
If you are worried about slippage, just put a very small hose clamp on the focuser shaft end.
You may pinch my idea if you want to.
See diagram below
