Schaller Signum Bridge C

I used this to replace the stoptail on my PRS SE Custom 24. The fit is perfect and there is a noticeable increase in sustain! However, when intonating one the strings, instead of moving the saddle forwards and back, the screw simply unscrewed itself from the bridge while the saddle sat still. This happened both with and without string tension on the saddle. To work around this issue I detensioned the string, turned the screw as much as I thought was necessary then, using the blunt end of some pliers, pushed the screw back into the bridge. The guitar is now intonated and, to be fair, none of the other saddles had any problems and sustain is good all-round.