Quote Originally Posted by irving2008 View Post
Hmmm..got a couple of 'approximate' quotes for hardening a 150mm length of 10mm - £80! and that depends on the actual steel used.

Maybe I need to learn how to do hardening at home... I have the book...
Not easily done just by the heating and quenching as the screw will almost certainly be low carbon steel.
The only easy way to do this is by pack hardening in something like Kasenite which makes a mess of fine details like a tap, hence the reference to molten cyanide.

If you fancy going this route, buy an extra 150 to 200 mm length, send it up and I'll flute it and get it hardened in with the next batch of gear that goes over.
I'll make two, you get one back, I keep one for payment.