you don't even need to boil water.
First - Take the wrist straps off (unscrew the screw in the top)
Second - Open door (it's easiest to have one the opens towards you)
Third - Put grip in door (between frame and door)
Fourth - Hold onto the rest of the poll as you put your foot on the door and yank that shit out.
Fifth - Get the hack saw out and cut off desired amount (after this I would recommend filling down the cut off part, just the smooth it out)
Finally - Put the handle back on (just slide it back on - you may need to twist it a bit) and screw the straps back on)
and there you have it, shorter polls. hope this helped, good luck.