Search youtube for LAZZEMETALSHAPING. He did a video about 7 years ago entitled ROLLING A BEAD WITH A WIRE EDGE. All of his videos are excellent. He is a great teacher. Good Luck!
According to the Sharkbite website:
PEX pipe can’t be heated or exposed to a direct flame. The best method to “loosen” the pipe for straightening is by soaking the pipe in warm water or running warm water through the pipe. Please make sure that the pipe is not exposed to direct UV rays.
EBAY has these for about $3.50 plus $1.00 shipping. Search for
"Strain Relief Cord Power Tools" Just the boot is all that's needed. It fits over a new round cord of your choice.
Thanks for posting this. I need exactly the same advice.
Edited - Sorry, I didn't realized that this was being covered in detail in another current thread.