have been going through a number of idler wheels on both sleds. the f7 more than the sabercat.i have picks lined up on them,so figured that was why. sabercat is not and is doing it now. was looking at both sleds after 600 miles up in cochrane. the new wheels were starting to come apart. looking further wheels look like there not straight up and down. like rails are twisting. if anyone is having the same problem. check yours and let me know. have a idea to fix. looking for input.