Chances are it is not the gimbal, but the thumb screw (wheel ) underneath. I had to put A LITTLE locktite on the threads to stiffen the wheel up. Now you need to hold the laser with one hand while adjusting the wheel with the other.

Once you have centered the laser unit you should not have to touch it again if the wheel is stiff.

What I did (do ) is to center it on a flat surface (as determined by a level ) and move the laser unit a couple of times with my finger tip to make sure it always hits the same spot. If it is sticking put a SMALL DROP of teflon gun lube on the swivel points and work it in. The teflon will not gum up with age, humidity and only minimally (compared to oil ) with dust/dirt.