Hey everyone,

So I made this DIY Wrist wrench from a rolling pin and it has helped a ton with my grip. However, I have gotten to a point (around 25 kgs) where it rather easily slips out of my hand rather than rolling out. Are there any suggestions on how to make the surface less slippery, as I feel I could get more out of it?

I have tried sports tape (only good for 1-2 sessions) and steering grip (from bike handle, which didnt work at all)