Swing Arm End Caps are marked "UP" because, if you will remove and inspect it, there is a notch cut out in the bottom to let water drain.By leaving them in upside down, the moisture can't get out and will corrode the inside of the swing arm. By the time you notice this on the outside, it will be too late, if you're not in the ditch somewhere anyway. Believe me, they would not cast them with the "UP" marking if they didn't have to.
Dang, I should flip it then. Any down side to loosening those tensioner nuts enough to rotate the cap and then tightening them up again.
Swing Arm End Caps are marked "UP" because, if you will remove and inspect it, there is a notch cut out in the bottom to let water drain.By leaving them in upside down, the moisture can't get out and will corrode the inside of the swing arm. By the time you notice this on the outside, it will be too late, if you're not in the ditch somewhere anyway. Believe me, they would not cast them with the "UP" marking if they didn't have to.
Sounds like I should flip it then. Probably time to take up some of the slack in my chain anyway.