i've always used wood sticks and recently picked up a stick that has replaceable blades. can anyone help me out with some info on how i can change the blades? i need to know what to use to heat up the bottom of the shaft? blowtorch? also, do i need glue to fasten the new blade in place? after heating up the shaft to remove the old blade, and replcaing that with a new blade, how do i firm up the shaft around the new blade so it's a tight fit? plyers? i know this is pretty rudimentary, but i've never done this, so any help would be greatly appreciated...thanks.