273 rebuild

Hi Michael,

the price is 73$ for six keys. That is really expensive. And in the end I just need one key.

I use ST52K. It is the correct material for this application.
The original width is 4,76mm. So I weaked the key for a offset from 5.5° about 0.7mm. This is 15% material attenuation.
I think it is ok, because I use the original valve springs.
But for the next key I will use a quenched and tempered steel.

Regards Martin