I have used them too, with a Tubus Tara rack on a Bridgestone MB-1 frame with MB-5 fork. I will say, with a fork taper like mine, they seem to loosen up if used on rough roads like the gravel fire roads in VT. I had to do some extra finagling to stop that.

If all you need is an attachment point at the dropout end go with a solution like prairiepedaler's. Maybe something like this: https://www.bikeparts.com/BPC412164/...-fender-eyelet If you have solid attachment points at the bottom you could probably eliminate the need for mid-fork braze-ons by using a rear rack designed for a single center mount at the top (in the picture with this it looks like the use of p-clamps at the bottom substitute for fender/rack eyelets) if you have a bolt hole at the top of your fork. Barring that you'll have to jury rig something along the lines of the Old Man Mountain to bring the attachments down to the canti bosses or slapping p-clamps on the fork blades. Note: that Pletscher rack doesn't strike me as something that could handle a "heavy" load.

For the best handling use a lowrider rack which requires the adapters at the mid-fork level.