I've been having a rather troublesome problem with bearing failure on my 48" Buntons. Seems that I'm constantly rebuilding the damm things. Sometimes they fail after just two weeks of cutting. I've done everthing I can think of - blades are balanced, greased regularly, etc... I've recently decided to give synthetic grease a shot - but at $5 a tube it's almost twice as expensive as the other stuff. Does anyone have any advice? Any advice would be appreciated. These machines work a lot (we do about 475 lawns a week around here) but bearing failure after 2 weeks on a new rebuild is just too soon. I'm willing to try anything to keep from having to change another spindle on the road or after work. Much appreciated.