I want to re-use my old Yakima round cross-bars with new Yakima towers to fit my new car. I can remove the endcaps. But I can’t get the towers to slide off. One tower can rotate in place a bit, so it’s not totally stuck on, but I cannot make any headway to get it to slide along the cross-bar and off the end. Any ideas? I don’t want to ruin the rubberized coating around the crossbar
. TYIA