Originally Posted by azcau
Point taken Woodlands , is there any reason why this might have happened ? It's definately a first for me .
It may have been that the bolt was not tightened when you last greased the thrust bearing or it could be the reverse gravity down under.
I would simply keep checking it before each run. My guess is that it was simply an oversight that will not likely recur due to your awareness of the situation.
Roger