Hey gang -
A quick question: on my fixed, I need to move my drive-side crankarm in by 4 to 5 mm in order to get good chainline. But, my early 80's steel Trek frame hasn't got the indentations in the chainstay that allow the crank to get close enough to the frame. As it stands, I'm using a 111mm BB with a 144bcd crankarm, and the arm clears by 2 mm. I'm intending to buy a 102mm BB to give me good chainline, but need a few more millimeters to get the crank to clear the frame.
Is it possible and/or safe to dent my chainstay to allow me the extra 3-5 mm necessary to move the crankarm in? If so, what's the best way to go about doing that? Do I run the risk of messing up my frame alignment?