I second the cryo freeze. Its done in Drag cars, race cars, brake rotors, etc. Its done mainly to transmissions in drag cars. Before the tranny usually had to be replaced after one run, but after cryo treatment the last several if not a dozen runs before blowing. What happens is the metal molecules are brought closer together and are stronger to wear.[/QUOTE
shouldn't you freeze the stock, that the part is machined from first, then make the part? It seem to me if you freeze the part it it would change the actual sizing, when we are measuring in thousands.
No, I don't know exactly why but the reason I believe is that it's a controlled freeze and to bring it back to normal temperature its done slowly.
It really works, just search on google and read about it.
You can do it to anything metal practically and end up with a stonger/better product. I've been waiting to do it to some hand tools.