Since getting my Grip off the Indiegogo campaign, it's always had a bit of play in the closed position. I assumed this was normal, but the more I see other people's videos using it, the more I feel like maybe that play shouldn't be there. If I open the Grip to 5mm, I can then wiggle it back and forth between the 5mm and 7mm marks. Is this normal? If not, is it something I can fix by tightening/loosening something?