I use hairspray when working on bikes that don't belong to me. Slip a spoke under the grip, give it a spray, and twist the grips off. A bit inside before installation and they slide right on. I bought 14 sets of ODI lock-on's, so I don't worry about my own bikes. Back in the day (early 1980's) Gorilla Snot was the hot product for keeping BMX grips on.