ok guys i need help on this one. i am doing a set of hood hinges for an old charger. the question is about the springs. i know that powder will work and they need to be blasted. my dilema is how to expand the spring for blasting and pc so the coils will be coated solid and not have bare spots where the coils lay together when relaxed. i have thought that some way to stretch them from the inside would be great, any ideas or suggestions.