well ive thoroughly, disassembled, and cleaned the distributor, replaced both bushings, cleaned and inspected the centrifugal advance,installed new points,condenser,rotor and cap,checked out the coil,all systems perfect,all clearances correct, put the dist. back on the tractor and have the exact same original problem, it runs 1 to 1 1/2 minutes and the points close and lose their gap, when taken apart the base of the point set is tight and has not moved, needless to say i am now seriously considering driving over the whole tractor with the d-8-R before i do, has anybody got any ideas, it just doesnt seem physically possible for this to be happening