Richard, Apart from covers it's worth considering getting rid of the ring in
the pip pins so that all of the holes can be much smaller. A small piece of
steel in the hole the ring goes through allows you to fish the pip pin out
and replace it with a tool that has a spiral groove that screws on to the
pip pin and pulls up the central portion of it, thus disengaging the pips.
The tool is only about a centimetre in diameter, (lives on the ignition key
ring), and the access holes in the tail planes and wing roots only need to
be slightly wider. This makes the system pretty much tamper proof, so that
no passing youth can readily go off with a pip pin to see how well the plane
flies without it, and also covering the hole with a small circle of sticky
white plastic is neat and easy. Regards, David Joyce, G-XSDJ
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