It's an extremely controlled slide tightening process using aluminum tightening blocks and an adjustable stop to prevent over-tightening. You work your way up the slide, tightening only the rear 3" or so. Tools are from Alpha Precision (proprietor Jim Stroh). Regarding peening, only the ends, about 1" at either end. You don't peen around the magazine well, too thin. I rely pretty heavily on Jerry Kuhnhausen's 1911 shop manual. The slide tightening tools come with detailed instructions. Oh yeah, I remember noticing another slide tightening tool option from Brownell's. Can't comment on it, no experience with it.
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