I have the Threaded shock bodies so I can' comment on the collars. What I can suggest, if you haven't tried this already. For the caps, make sure the rubber seal is where it is supposed to be, then place the cap on top and turn it the opposite direction (as if you were loosening it) until you feel the click of the thread end, then begin to slowly screw it on. It should go on straight. It is possible that you have cross threaded them I guess if you forced it on "wonky".
I really hope that helps.
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