I am working on a friend's 1983 Yamaha QT50 (Yamahopper). I am going to make sure the spoke nipples are not frozen and true the wheels. I have not found a spoke wrench that will fit it, but from measuring a spoke nipple with some dial calipers it looks like barely over 4 mm. I am getting a Park Tool bicycle spoke wrench that is 3.96 mm. It is three sided. Any ideas on how to sand / grind away at one side to make it a little bigger?
Thanks!