Thanks Bob. So an inch and 3/32s eh? I was staying away from the spool for now, I'm still spending cash in other areas to prepare for next season. But since factory GM axles fail, I guess nhra deems it necessary for everyone else to support the after market axle industry . I don't like the rule, as there are no real specs or parameters other than "aftermarket"....whatever that means. I guess I was just curious as to how much clearance to run between the buttons and the green bearinged axles...