I am rebarreling a 10-22 with a .17M2 barrel. I have a weighted charging handle that came with the barrel but can't figure out how to get the factory handle off and slip the new weighted handle on...I'm sure it's easy and that I'm missing something but just can't seem to make it work. The end of the guide rod has a groove and a slight bend in it about 1/8" from the end. I presume this is meant to hold the spring and charging handle in place. So how do I remove the handle? Thx for any help. 