I figured it was your KFL19. Your grub screw is not screwed in far enough.I think it's the 510. The finicky mod is a ProVari 2.5, and it also has trouble with the KFL19. I suppose, too, it could be on its way out--who knows how old it is. Guess I'll find out. For now, it's playing welll with a Doggy.
Take your KFL19 and at the 510 screw the nylon grub screw in further. Go to about 1.5-2mm in w/the grub screw and then try it with your ProVari.
Your PV's 510 is fitting inside the 510 of the KFL19.
I had your same issue with the 19's and my JAC's. After adjusting the grub screw they worked fine.
Here's the deal, the diameters of the 510 pins in our mods are not all the same sizes. Some have smaller diameters like the JAC and I'm guessing your ProVari. What is happening is the mods 510 pin is making contact with the nylon grub screw and then reading "atty short".
ETA: Just saw it was your Tripod.
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