Never tried it... and TBH I always use a solid horn now. When I used a Kimborough saver, found that it rubbbed on the chassis plate (with the 415 at least). Running a solid horn removes that possibility, and takes slop out the system... I'm a good enough driver now to not hit things too
I thought I'd done my first servo last meeting (felt gritty), so I took the S9550 apart, but couldn't find the problem (all the gears are fine). Seems that the splines on the horn had stripped instead
Just to be suere though, I've retired the servo to my mini...
Regards
Ed