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I’ve done body work for many years. Shrinking metal can be one of the most aggravating. Ive used several methods in the past; torch, Stinger, etc. I’ve had a shrinking disc in my shop for at least 12-15 years! New in the box! Duh!?
Recently I watched several YouTube videos regarding the discs use. Having a necessary application, I tried it out and found that it works great. I have the 9” and 5”; the 5” seems to be what works in my current application. I can see where the 9” would be better on a later model hood or any deck lid.
If you have an application, watch the videos and try it. It’s a fairly small investment especially if you already have the grinder(s)