Never had any luck straightening shafts over any length of time. They have all re warped after about 18 months to 2 years.
As for a handle, I have not tried to straighten them at all.My view is if it is warped then if it is not warped back to staright, something will have to give. Anything loose in the handle is just detrimental to the playablitity of the assembly.
Neil
I have straightened shafts at times. But rarely do they hold straight. About the only ones I saw stay straight were newer cues that someone bought and then noticed a wobble in it within a few weeks. For some reason if you catch it early in the cues life like that and you straighten it on a table by bending it then, immediately sand it on a lathe and reseal it, they might hold. I learned that trick from my days as a pool room owner selling other brands of cues. If the shaft has too much time to develop that bent memory you will almost never get it to hold straight again. It is kind of like us humans; If we stay in a bad habit for too long it almost takes a miracle for us to get straightened out again and stay straight.