So, my 1983 Schwinn SS SP is coming together nicely, but the FD I am hoping to use has a 28.6mm clamp where as the OD of the seat tube is 28.8mm without paint. I figured that, even after paint, I'll only need to remove 0.4mm or so and its not a part that is prone to failure (unless it has a plastic or CF clamp).

I'm pretty set on the FD I want to use, a reverse pull Suntour SL, which I've only been able to find with a 28.6mm clamp. The original FD was an "infinity clamp" Suntour M-II which I still have but its in rough shape and I love the reverse pull on my other SL FD bike.

So, have any of you done this? Would you do so in my situation? How should I file the clamp so that I get a consistent size all the way around?

Thanks