You dont need to take the strap off, just unscrew the set-screws on the bottom and pull it off. I have actually used 2 different pairs of line pins, but only one of them had the grip glued on. not sure why they did this, but if your poles have the glue the the only way to get them off is to heat some water and let them site for a few minutes and pull them off. plus it makes a really cool noise when you pull them off
also, dont put them in a vise unless you for some reason only need to clamp them a slight amount. the aluminum crushes very easily