To give you an update on my process and success.

I used nail polish. On the Winter there is a cover (with the model and
serial number) which can be swung out of the way after loosing a screw.
I put the nail polish under that. The reasoning was that 1) the cover
will hide the polish and 2) placing a weight closer to the center
requires more weight to do the job (shorter moment arm). Thus, I have
more control over what I am doing.

It did take several coats as each coat dries and looses weight. The
trick was to determine if what I added was correct. I did the
following;

1) Added some nail polish with a toothpick to make the needle go to
zero.
2) CAREFULLY blow into the static and/or TE probe line fittings to
reset the needle.
NEVER BLOW DIRECTLY INTO THE INSTRUMENT as this is a very delicate
instrument. What I did was hold the vario facing me, then cupped my
hand behind the vario, the GENTLY blew into my hand. This deflected a
bit of air into the probe line fitting and deflected the needle. Hold
the vario as it will be in flight, face held vertical.
3) Let the nail polish dry and use step 2 again to see if the needle
rests at zero.
4) Repeat these steps as necessary.

Good luck.

- John