Just looked at Mr Sleds track change video. I’ve never taken the cover off, but looks like as you said chain case cover bolts. 2 from the bottom and 1 on top? Surprised it’s not leaking chain case oil. I loaded it at dark and didn’t get a good look at it when I left up north. I’ll have a look next week when I go back upI’m guessing your chain case cover is missing those three bolts. Several of the bolts are longer and hold the case and cover simultaneously. They’ve obviously been installed correctly and are doing an excellent job.