Hi. I have a Watson Transmission model 42. I have just had it totally rebuilt with all new bearings by a professional mechanic. But the tail shaft still has play it it. If I grab the brake drum for the hand brake I can wobble it. I am not happy about this. But the chap who did it up said this is ok? He is not new at this. Should I pull the rear flange off and put a shim in and put it back and see if this fixes it? I am thinking the flange maybe coming up and bottoming out on the end of the main shaft. Thoughts please