Good quality but needs improving - Wilcox Stubby Vertical Grip

I just got this vertical grip and its loose, you put your hand around it and it turn slightly on you, its annoying. Its made with quality materials but for a fact it needs improvements made, to fix that problem. I ordered a second one and I will be sending this one back, I just dont like how it will twist on you when you put pressure on it with your hand, it should stay put and not turn, not even a hair, but it does.

Danny C