I use solid aluminum horn in all my cars, and not seeing any damage to the plastic servo cases that have stripped titanium gears, although I recently swapped out to a Tessman edition servo on my K2 to see how well it can handle the abuse with captured ball ends... unfortunately the 1/10 program in our area is on hold as they rebuild the track (to include new building enclosure) with Astroturf. Also not convinced that a 1/8 servo saver fully tightened won't still allow some play in the harshest landings/crashes. I tend to run my savers a bit on the tight side as well.