I attempted to remove the drive side crank arm on a Rize Leisure. (6 months old) I was using a Bikehand crank remover tool. (See attachment) I made certain that the tool threaded in all the way and tightened it with a wrench and that the puller bolt was backed off all the way . I then started to turn in the puller bolt in and when it got to requiring heavy pressure, the tool popped out of the crank arm threads. I have purchased new crank arms but does anyone have any ideas how to get the old crank arm off?