Fitting throttle hand grip?

[ReggieGasket]

I've fitted a couple of Renthal grips for my track day tomorrow and the right hand grip is too loose as the throttle is odd - it's not a smooth surface like most throttles, so the grip doesn't get snug. Left hand one is perfect. Any suggestions? I could tape the throttle up, but not sure if that would hold all day. It's too loose to use lock wire or cable ties even.

[Aladinsaneuk]

Plumbers tape and hairspray