Yea I take the beam off the base to adjust. Any time my lee beam scale acts wonky I know the end is probably touching the magnet. just reposition so its not touching and its good again. On mine, the end is really close to the "front" magnet so if its not on just right it touches, but I can get it on good the first try 9 times out of 10...
I'm not sure about the FA scale yet... If I calibrate it it works and matches the lee scale, but a few times its started to go off track, and I have had to calibrate it again, but its like 45F in my basement where I am loading so i wonder if the cold is affecting it or something...
I dont entirely trust it yet, I still like to verify things with my beam scale before loading, but I use it to adjust my perfect powder measure for load development and switching between calibers, makes it much easier to know how far off I am on the load I am trying to drop.... I've only used it a few times though....