My TPIS runners have dents in them from the previous owner. Is there a way to remove them?

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
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I have removed some with pliers, a punch, wood, whatever I can get my hands on. Its soft stuff, so its easy to make even more damage if you arent careful. A method I have not tried yet is the ball bearing method. You get a steel ball the size of the runner, and force it through. Sounds good enough in theory... and if you can find the appropriate ball.

 

I read somewhere before that a guy used a woode ball, like you can get in a hardware or hobby place. He said it worked pretty good. Later

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'87GTA w/ SLP Cold Air, MSD Coil, Airfoil, Gutted MAF, AFPR, TES Headers, HI-FLOW CAT, Flowmaster Catback, Energy Suspension Master Bushing Kit