Just learned this trick not long ago. Spray hair spray on the bare bar, and a little inside the rubber grip, BE REAL FAST ABOUT IT ! ! , it drys quickly. Quickly shove the rubber grip on, and it will not slide off when you are riding after the hair spray is dry. To remove same take a narrow thin table knife slip it under the rubber grip, breaking the bond to remove the grip easily. But they will not come off and become dangerous while riding down the road , until you break that bond.