I'm changing spindle bearings for the first time on this deck. Are there any tricks to getting the bearings to slide into the hub? Does anyone put the bearings into the freezer before installing? Also, when I took mine apart, the top boss had a lot of wear wear it fits into the seal and there were 2 shims placed on the lower side of the boss, I'm assuming because of the wear. Does adding shims make sense or should I just replace the boss? Thanks