triangle voice

[Michael Kiermaier]

I wrote a triangle voice using a RhythmicStaff.

There are two problems I want to show by a small example:

\version "2.8.6"

triangolo = {
  \clef percussion
  c c c c |
  \mark \default |
  \repeat "percent" 50 {c2 c |}
}

\new RhythmicStaff {
  \triangolo
}

1) The rehersal mark collides with the bar line. Is there a way to raise all 
the rehersal marks by a certain distance?

2) the percussion clef doesn't get printed.


I also played around with DrumStaff staffs, but I did not get the results I 
wanted.

~Michael