Hey all, I have nowhere else to ask this question, so I figured this section of the forum would be best.

Anyway, I have a steel 29er frame that fits me perfectly except for the fact that I can't seem to get low enough on the front end. I know, the easiest step is to get the next size down, but having ridden that size, I feel overly cramped which is something I definitely DO NOT want while racing XC.

So, there's about, oh, I'd say a good usable centimeter of steel on the top of the head tube before I would even consider it being an issue of interfering with the weld to the top tube.

I know most frame building shops have a lathe with a headtube cutter used more for facing than milling, but I figured I could pay for the cutter to be sharpened after anyway.

After that incredibly long, rambling into, I'm just curious if there are foreseen structural issues with milling down my headtube? I know milling from the bottom can alter the steering angle, but I can't figure out any other downsides to taking the headtube down 5mm on top.