I've done the cold bend on three shafts in the past, one just over a year ago, one many months ago and yesterday. The cue from over a year ago is still straight, as is the one from a few months ago. The shaft I did yesterday was an old c series McD that I got from Jayman. I like the heat idea. I had thought about keeping a shaft a hot bathroom during a shower too see if that would help. Thanks for he write up.