Originally Posted by
roscoe1972
I can't find a allen wrench that will fit the stem. It doesn't look that corroded, but possibly the steel has been flattened to block the wrench from going in.
Originally Posted by
auchencrow
If neither a 6mm nor 7mm key will go in, I would suspect ^this^ is the reason.
If this is the case, it may be worthwhile to try a 17/64" Allen key.