Giottos MH1312-652 Locking

I have a uni-loc ball head, however it is not got a rotating base so I decided to replace it with the MH1312.

The Uni-Loc locks positively with out a great deal of pressure being applied to the lever. Using the locking knob on the MH1312 I can still move the ball head with it tightened by what I would consider a reasonable force. All it seems to do is increase the friction by a larger amount than the smaller friction knob. With the camera mounted on the head I can move the camera by holding the head with my fingers and using my thumb to apply pressure. I'm not using it with a heavy camera/lens combination so it is held in the same position.

Should I expect a more positive locking action on the ball from the locking knob?

I use the MH1312 and it has been OK. I use mine with Sigma 150-500 and a K10D and has caused no problems.
Derek

I Thanks, I assume that this means it is normal, I have been spoiled by the uni-loc then.