Sorry, yes the bumper. I should not post before I am fully awake.
Yes, the bumper, and it is press fit.
I just can't get it to all the way back on.
Just so we're all on the same page, a butt cap is the plastic/composite part glued to the back-end of the cue and it's typically not designed to come off. The bumper, which is at the very end, is made of rubber. They're usually either held with a screw, threaded in or press fit.
It sounds like you're describing the bumper. On your cue it should be a press fit.
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Girl spit!!!! Thats the shit!