Steve,

Don't bother telling someone with a few hundred hours in the machine shop how "I'll ruin the head by reaming it". It's the correct way- if you know what you are doing.

As far as having "MB correct tool." Honestly, current mechanics crack me up! You really could learn to save a bunch of $$ by learning basic metal working and heat treating. I made my 0M617 go-nogo gauge in less than 20 minutes out of drill rod, heat-treated, tempered, polished to the final dimension. Very simple and not hard. If I need a correct driver, I will just choose some steel and make one.
I had general machine shop stuff at the university and made rack & pinion, a couple of really sweet flywheels, a full set of heli-coil install tools, etc etc..
Horology school added the precision into my work- ever work with a shaft pivot shaft diameter of 0.03-0.04 mm?

I know what your saying on loose guides and for that matter-seats. Dealt with it all before.


Michael

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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
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86 300E