Wow,
cbreeze, that's scary!
I've got the Klett on a 120 Stinger; An 80" GP Spacewalker; An Ultra Stick and a now, built but unflown, 4*60 and have never experienced that problem with the first three, the 4* remains unproven.
I just went over and pressed the Klett on the 4* and I can see, on a
really hard landing, it could touch the rudder, but boy, it would be a rough one.
I've used the Sullivan on a few (isn't that the one with the wire to the rudder?), and it works well, too.
I appreciate the head's-up, I'll be looking for scuff marks on the rudder bottom on the 4*.
Thanks for the tip!