So I've got a bit of a problem.

I gave my 53cm Univega frame to my girlfriend so that she could put together her own bike. The fork had been damaged in an accident, so I picked up a new one off ebay. The measurements stated in the auction made it seem like it would fit but... it's about 3mm shy of being able to have the locking nut(?) thread on. Now, her dad machines drag racing engine blocks for a living, so we're thinking that maybe he can just cut down the top of the steerer tube with one of his neat cutting doo-hickies by a few millimeters and have everything line up. However, I was wondering if maybe a threaded to threadless adaptor might solve the problem provided I got a threadless headset.

Could this work? I think that he could cut it down and have enough space to still fit the headset cup, but if not... I don't know. It seems like a lot of work, but she likes the fork a lot.