Bought a used PRS SE Standard 24, without the tremolo arm that got lost somewhere along its musical journeys. Though I'm not an avid user of the trem I couldn't stand the guitar being without. Thus, Thomann to the rescue!
The trem arm is pretty cheap and it's a sort of push fit. It fits perfectly though it could be a bit more firm still (so it doesn't turn around when you put the guitar away), but I believe the trem block can be adjusted.
Special thanks to Thomann, it was backordered 5 weeks, so they quickly shipped the rest of my order and this arrived just 3 weeks later. Excellent service!