Stop.

Blackburn, Vetta, Jandd and most low rider racks came with polymer coated U-bolts that attached mid-point on the fork for those bikes without braze-ons. Many racks still do (Nashbars front rack for suspension forks, as an example). They worked, and continue to work just fine (I have seen bikes/racks with 1000's of miles under their belt set up this way). If you have an LBS that has been around more than 20-years, they ought to keep them in thier rack-hardware-junk-drawer. If not, you can find the U-bolts at a decent harware store, though they are not poly coated (use bar/electrical/duct tape instead).

I can take a picture if you are still confused.

I would NOT recommend soldering, welding, brazing, gluing, taping, sticking, fuzing, or otherwise screwing-up your fork for the sake of a front rack.