I find myself using those kitchen grabbie things more and more the older I get.If you had seen me trying to get the top cap off an rba,you would have died laughing. I used:
3 types of pliers
vise grip
those kitchen grabbie things
putting in freezer
putting in hot water
tapping with a hammer
rubber bands
finally put it on a coil master and twisted/pulled with pliers. It came off but also took the adapter thing off the coilmaster.