Originally Posted by ThermionicScott

132mm, wow. And I haven't taken any of my frames past 126mm yet.

There are a lot of elegant and inelegant methods out there for dimpling the stays, mine is somewhere in the middle. I took a spare pair of vise-grips and ground out one jaw to be smooth and more or less the radius of the outside of a chainstay, then padded it with a few layers of duct tape. I also ground one side of an 11/16" wrench to be rounded and smooth, and so my process is to place the rounded side of the wrench where I want to make the dimple, open up the vise-grips a bunch to fit around the chainstay and inner face of the wrench, and then gently squeeze. I try to only do a little at a time, and you don't have to make a deep impression on the inside of the chainstay to open up a decent amount of tire clearance. Afterward, it's a good idea to double-check your dropout alignment.

Originally Posted by ThermionicScott

Sure, they're more like 8-9 inches. I don't know much about vice grip sizing, I just grabbed a redundant pair and took them to the bench grinder until one of the jaw faces was pretty smooth and roughly the radius of a chainstay.