Hi Doc
link to a discussion in my lespaul.com about frx and a small excerpt in regards rubber feet at front of trem unit and further down the thread in regards spring tension

http://www.mylespaul.com/threads/ins...studio.325147/

"The part that the installation video didn't mention is how important it is to get the height of the rubber feet at the front exactly, perfectly right. If they're not down far enough, the trem flutter and tuning stability go away, since the front of the frame keeps moving slightly. Too tight, and the base frame is canted up, making the playing position wonky. Those feet slowly compress into shape slightly over the course of a couple of weeks, so I've spent some time doing slight adjustments."