Please check if you had choosen the right screw,
-> one is used to activate the ratchet,
-> one is ued to activate friction function.
Normally you can turn a little more than 3 turns, but you have to take care that you do not overtighten the screw. If it is tighten to strong it could loose the screwhead
If this does not work, please remove the backcover, and turn the screw of the opposite side a little counterclockwise, then try again.
Best regards