Back when this forum started most of the originals were doing trial and error modifying their bikes. Mostly because we were running into the BD proprietary parts. It was somewhat aggravating but it was a learning curve that was added to by many.
Some enjoy the wrenching almost as much as the ride.
I finally put my front fender on last year after a few years of not having. My spacers are .425". There is some flex with the bracket/fender. I used nylon nuts, maybe 3/8. They look fine, at least good enough, well not that bad, ok redneck riviera here but fender is centered!