Originally posted by Turbo Joe
For the advice. I started to build a ball diff out of spares I have here, since I have Pro 4 outdrives and an extra gear and a bunch of everything else from the 2 and 3...something went awry (haven't checked it out yet) and I ended up with a spool...LOL
Sooo....how are spools for low traction? 
Whatever I did wrong, it locked solid in 1-2 turns of the screw. 
maybe you forgot to put in the thrust bearing spring... I built one up from spare parts as well..and I forgot the spring...and it locked up...