Assuming the rim joint is not in the affected area...
I use an English wood vise.
1. Two 1/4" inch thick and 1" inch wide vertical strips of wood on the inside - spread out.
2. A 1 x 2 x 3 block with a slightly curved press point placed on the clamping side of the vise.
3. I assemble inner blocks, rim and press block in the vise.
4. The vice itself acts as a press.
5. I stop when the rim is 1/8" past it's original line.
I use this method for tacos....and also for flat spots on box profile rims.
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life