According to the Schaller website: "When fitting the "Schaller Tremolo" or the "Schaller Low Profile" to your guitar, you can simply pull out the knife edges with a pliers and push the new ones into the insertion slot". The harder thing will be finding new replacement knife inserts to begin with.
are these removable ?
i was initially trying to fit an old schaller bridge with rectuangular blades and it wouldn't fit
maybe that was back then and the new models aren't any different