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  1. Interesting one. The issue is if you are riding and it has a catastrophic failure, your safety is going to be massively compromised. I would say. Take the rear wheel out. And if you can slide the entire dropout sleeve out. Research aerospace and aircraft adhesives. Then wack a load of that on there. After it has set go for an easy pedal round the block and see if it holds up. If not visit your LBS or find a local frame builder and see what they recommend.

  2. I bet something like jb weld would work great. 

    I’d take the wheel off and see how loose it actually is first. If it’s really loose I’d take it off and look for damage and clean out any dirt or debris with wd40 followed by rubbing alcohol. I *might* sand it a little too rough up the surface. 

    Then I’d glue it back in place with jb weld or any other very strong glue rated for metal to metal. I would *not* use quick set anything. While it cures I would clamp it in place with a hose clamp or something similar through the dropout and rear triangle. 

    Edit: the other thing you could do is add a set screw, but that’s much more difficult. 

  3. That’s an odd enough failure that it might be worth your while to contact trek and talk to them about warranty or tech  support. 
    If I were to try fixing it myself, I’d try loctite brand wicking bearing retainer if the steel plate can slide off and allow the surfaces to be cleaned. 
    Do you do a lot of skid stopping? It’s tr only way I can think of that the hub would pull the plate back like that. 

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