Another way to get grips off -especially old vintage grips that have "glued" themselves to the bars over time is to use Tri-Flow.

I take a long small control-wiring flat screwdriver to carefully insert into the front of the grip and slide back under it. Then I put the long red straw of the Tri-Flow in next to the screwdriver shaft as far back into the grip as I can and squirt in the oil. If you can do this 2-3 more times around the diameter of the grip you can pretty much get most of the grip lubricated. Then it is a simple matter to carefully work and twist the grip until it breaks free and just slides off.

Soak the oily grip in a pan o blue Dawn detergent and the Tri-Flow washes right off and you are left with a good undamaged vintage grip that is ready to be re-installed later.