John wrote:

/snip/
The filler screw has a sealing washer.It's best
filled with a throw-away syringe.
Fill to the top. Screw closed.
Turn several ways. Look for the air bubble.
Repeat. Three or four times. You finally get lucky,
with no bubble at all....
If the worse comes to the worst - a replacement
unit is $110-$130 from the aero suppliers.

Brian W


One technique for filling with no bubbles is to submerge the compass
in a small can filled with fluid with the plug off. Roll and turn the
compass around until no bubbles flow out. Install the plug while the
compass is still submerged./snip/

John Dupre'

That sounds like a neat method: the approved repair kit does not carry
enough fluid for that approach though.

Brian W