the up guys are great

and dirt is always the problem....a words of note

1) dont get to crasy with original lubeing..if you do this can cause it

2) lubeing lasts for years not 1 or 2 but several

3) snug tight firm the locking nut dont kill it

4) if you ever nick one they will send you some...free....send them a sase and a note...find their address on the net in canada...dont replace with standard replacement ones...as their`s are fatter than stock ones found in those mulitple size replacement boxes

5) they are great guys just email them and they help if needed

hope this helps

gregg