Re: Recomend a muffler shop
The point of correct mandrel bending is to pull the mandrel through the bend which should maintain the diameter of the mandrel through the bend. The mandrels are typically made of bronze so there is some wear, but they really shouldn't be decreasing the diameter if it is really a mandrel bender. The only bends I have ever recieved from Heartthrob maintained the right diameter.
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