Heavy and does not hold the drill yet

I have this chuck, preferred the original from Bosch for my hammer Uneo, which otherwise only SDS Quick or hexagon drill bits receives due to the low price. Unfortunately, since the chuck holds the drill round not sure, so this by turning often. So the chuck rotates the drill in the wall or in wooden (!) Do not rotate. Because there is also no use the food with the help of pliers brake application. If you want to open it again one turns out more often bitholder the screw hexagon, as that the jaws open. For small drills it is very difficult and this bend under its own weight, as it also does not get stuck in certain Neo. Drilling with round drills I do therefore rather be back with a normal cordless drill. For Uneo the thing is not recommended here.