Since we're on the subject of diff's, what do you consider to be the best assembly of rings, balls and tension device (bellville washers, crush sleeves etc)??? This is for a Stealth-type large ring axle. I know about the Slapmaster thrust bearing but what else would you use to assemble a top of the line diff? I started R/C in offroad and was wondering about the use of a typical coil spring like what is used in an RC10B4 diff...is there such a beast for 12th scale? I'd like something with a wider adjustment range than the bellville washers provide. Any ideas are greatly appreciated, thanks in advance!!!!