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You need to red loctite the main nut retainer screws (I believe they are 1/4x20 socket button head). I would also be checking both the 5th gear and trap door bearings. After 3 times I would think there might be a little excessive vibration going on there..
Yea, I'm thinking about doing an overhaul (bearings, 5th gear shaft and shifter pawl and spring)