Black friction tape and gas. Just a thin, no overlap, wrap of that old fashioned (pre-vinyl) cloth electrical tape, dampen it with gas and slide the grip on.
Similar to the paper golf tape method but cheaper and maybe stronger and the roll of tape has other uses too.
Works great to lock down those loose or spinning foot peg rubbers too.
My friend Frank Forster told me about it when he saw the safety wire on my Commando's foot peg rubbers.