After reading a couple threads about replacing the chain slipper with a roller, I went and got a large Moose roller ( 42 or 43 mm.dia.) at my local shop, but the bolt is too large to fit through the hole in the frame. Should I drill the hole in the frame a little bigger? Or should I just get a smaller diameter bolt ? I would think the sealed bearings in the rollers would be damaged after banging around a while with a smaller bolt. But, there's not a whole lot of extra metal around the hole where I'd be drilling, so I didn't want to do anything without checking first. Any advice much appreciated......... BTW, I'm always confusing "slipper" and "slider",so just in case, I'm refering to the block of rubber just behind and below the drive sprocket.