Thanks for your reply! I have already removed the cable and the poplock mechanism does rotate freely. The movement of the mechanism is totally smooth. I did notice, however, that its spring is not as strong as the one on my previous fork (a Duke Race with poplock). Could this be the reason for why the thing is not releasing properly? I still need to check whether the poploc mechanism rotates freely under load (with the cable off), but I am unfortunately not with my bike at the moment. Will report back on that asap.