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Im in the process of reworking my early t20 (without thrust washers) to accept thrust washers by following the idea that whipper used in his video. Facing the planetary drum down .043 is easy work, however in the second step that he shows im afraid my measurements would be much different from his being as the wear surface of my drum is already well worn. anybody got a sketch, or better yet a blueprint (yeah right) of late model drums that i can reference. Or.....am i just looking at this the wrong way? 
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