Is it possible to drill out a 1" head tube to enable the use of a 1 1/8" headset and fork, or would the structural integrity of the frame be compromised? I'm looking at purchasing a rigid steel frame with a 1" head tube for a singlespeed project, and I'd like to be able to use the fork(s) I've already got (both are 1 1/8) with it. I could swear I read that this was possible online somewhere. I thought it was at Sheldon Brown's site, but I can't seem to find it again. Thanks in advance!