How to *properly* straighten out TVP's (or metal..)

i do the same thing... but place the tvp's in between two pieces of wood then tighten down... allows it to straighten the entire length in one go so it removes any tweak.

straightning metal damages it... no matter how you do it... it will always weaken it... unless you heat it then re temper it... but thats hard :P

so once it gets too flexible just replace it :P