He uses a hair dryer heater while rotating the pen in his fingertips keeping it in constant motion, eventually it softens to the point he rotates the pen in his palm to start the straightening and returning to the heater repeatedly. When reasonably straight he will roll the pen on a table top and adjust the straightening with his palms as needed. Takes lots of practice experimenting with level of heat, rotation and rolling on table top. If you have some really trashed old hard rubber that looks like a banana it would be fun to try this.
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