I just finished doing my second attempt at rebuilding my first DL50 after the bearings spun. The first time I rebuilt last week the bearings jammed tight and were binding. After disassembly I found that the new crankcase I bought had a small ridge in the rear bearing cavity causing the bearing not to seat all the way. So when I tightened down the propshaft it pulled the rear bearings inner race forward causing the binding. I had used Loctite 620 so it took alot of heat to get it apart again. I played it safe and ordered new bearings again and this time it all went together correctly after cutting out the ridge that was left over from when DL machined the crankcase. I had a spare DL50 on hand so it replaced this one in my Wagstaff 300. This one will be destined for a 33% Spacewalker now that it is rebuilt.