I have pretty much decided that when the one I have breaks, I'll probably
replace it with a SIRS compass: http://www.sirs.co.uk/aircraft%20light.htm


O.K., but the gent asked about a vertical card compass repair, SIRS only
appears to produce conventional wet compasses.

As another poster suggested, the obvious "repair" may be to replace the
Hamilton with a Precision PAI700 vertical card compass (Chief Aircraft
and others). Around $300 with mount. One piece, no electronics except
for the light.

Be aware though that some have had difficulty in keeping these units
accurate. One web site suggests that an installation using a magnetized
screwdriver knocks these things permanently off their gimbals. I have
had one go toes up.

Even if they do die every couple of years, I will still replace them
given the useless (whiskey compass) alternatives.

Good Luck,
Mike