Hi,
I normally do not post about my instrument sales business, however, it
seems I am the only supplier that has continued to stock the PZL K13a
compass. The company that distributes this compass changed hands 2
years ago and the prices have been adjusted significantly. $389.00.
This makes it the most expensive whisley compass on the market but it
also has some unique features... size, mounting options, and quality.

I have found that most of the leaking issues are due to burning a hole
in it, or over tightening the mounting ring which causes a stress riser
as the compass body expands when heated. If you have a PZL compass
installed, you may want to check the tension on the band. Shoud just
be snugged to hold it from slipping.

The vertical card compasses are very sensitive to binding caused by
mounting with a stress load. Many glider instrument panels are very
thin with only 2-3 layers of light carbon cloth. When populated with a
full complement of instruments, each instrument becomes a structural
component. If the vertical card compass is one of these, there may be
a chance that it will become disformed slightly especially with changes
in temp thus it will hang up. It is easier to read when it is stuck!!

Rex
Williams Soaring Center