well the keyslot on my crankshaft that the harmonic pulley goes on, the left side key wall broke away now they pulley wobbles like crazy and the threads for the pulley bolt are bad. my question is should i bring the crank to a machine shop and hope they can fill the existing key hole and make a new one on the other side of the shaft and tap the threads, or just buy a new crankshaft, if this what crankshaft would you reccommend for a B18C5