pic: 8020 Chain Tensioning idea

[cdennisxlx2]

I would be more worried about the tensioning bolt vibrating loose during game play, if your just going to tap the baring block hole and use a bolt that's a real risk. I would look into making it a straight bore through and using a longer bolt with a nylock nut on the other side, it wont slip and you can tension it just using a nut driver. It would also allow you to keep a more or less even tensioning on all your wheels because you could just easily measure the amount of bolt that's through the nut and make adjustments accordingly on the remaining wheels.