Stan,
I can't imagine doing the job by hand as you did! Even using the twist tool was a pain, especially un tight spaces. I can still see all those Dzus fasteners.
Back on track, I have two Browning BSS-SL guns that have the Anson push button. I've never considered the possibility of the buttons coming loose. I have heard of the adjustment in the rod preventing the forend from releasing off the barrels though. Either problem could be bad.
Karl