I've got too many gliders on the curtain track, which get in the way of the curtain running smoothly, but I can't figure out how to get the extra ones off. The end pieces of the track don't seem to come off and I'm scared I'll break it if I use too much force. The gliders themselves have a small square bit that fits into the track, so they can't be turned sideways for removal as some gliders can. Please help!