If it were me, I would remove the grips completely, clean and reinstall. Less chance of tearing the grips that way. I took my OEM grips of using simple rubbing alcohol. Gently peel back the end of the grip, pour some rubbing alcohol in, work it down the grip by gently twisting back and forth, add more, twist and pop, off they came.This is interesting. Mine is about an inch and a half off the end also. How did you get it to go back up? Mine is hard as hell to move. Soapy water perhaps?
Check the Ebay link in the forums. If you want cheap, there are some under $10.trying this tonight... Have the same issue with the left grip. Would like to eventually upgrade to better grips... Any cheap suggestions?