I hate vive wand grip, it is example of bad design. It is possible to click it, but to use it more than 10minutes in games, that is impossible.
To make it more tolerable, I glued some velcro on grip buttons (2 layers, cca 2mm thick, small red peaces on pictures), and a black plastic bottle, cutted 2 parts (1 for each controller). Rubbers are holding plastic part on wand, and with pushing rubbers up or down on controller, I can choose optimal pressure on grip. (EDIT: It must be easy to click without much force, but clicking has to work every time - find that spot and enjoy)
It works, and it is much better than without.
Ps: I use my hand strap like on picture, no need for this just for grip mod!