I have never used a Gitzo, but I have been given a Cremaillere 3 center column and am uncertain about just how it is supposed to work. The crank smoothly winds the platform up just fine, but the lever need to be held down in order to lower it. I assume the lever is for locking the position of the column, but this seems awkward to me because lowering the platform seems to require two hands. Is this the design of this geared column or is this unit somehow defective?

Thanks for your help with this. ---HtheD