I read through the whole thread and didn't find anyone making one important comment. Have you, by allowing him to chip in $100 toward the new saw, given him a sense of entitlement to borrow it when ever he sees fit? That opens a whole new can of worms. Or, if you both consider the new saw a totally separate deal, then his $100 goes toward the repair of the 'old' saw and I suppose you could consider that a loaner... if necessary. But I'm glad you get to keep your buddy. That's the most important thing. Let us know if he shows up when the splitting begins.