"But unfortunately before I could get to finish the whole adjustment, I snapped a valve adjustment screw."
Just as a note--because we've probably all snapped a B18/20 adjuster screw at one time or another (a 6" or less length wrench helps avoid this)----the last shop I worked in did a lot of British sports car work -- we found the screws in MG (1.8 litre motors) rocker arms fit nicely and seem to be of a "harder" less snapable metal. The fault may not even be your own--who knows how tight/stretched someone else left it the last valve adjustment. -- Dave
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