like u said freeze bearings, put cases in oven for 20 mins on 200 get em red hot, bearings wil drop in crank in freezer for a few hour and it will drop straight in to the inner races, just support the cases with some thick wood so its high enuf and flat when u have the cases 2gether give the crank a tap either end with mallet till it spinns freely u may hear a loud knock when it sentres but u cant get it wrong as u tighten the cases it centres its self
