Resetting Winter Vario to Zero?

I think the nail polish idea has merit.

If you want to go with the mechanical adjustment, you will need to
remove the glass face and then unscrew the small plate covering the
base of the needle. Once this plate is removed, you will see a
serrated circular adjustment ring which you can rotate to adjust zero.
You need to be careful with this plate, as a small movement makes a
significant adjustment to zero.

ContestID67 wrote:
I have a Winter variometer that works great except that at rest it
reads high (+1.5). While that makes me feel good in flight, I'd rather
zero the thing out. The question is how to do this.

I have been told two different ways to do this;

1) Find the zero adjustment - I removed the face plate but cannot find
the adjustment. Any ideas?

2) One person mentioned that over time the needle looses weight.
Because these devices are so sensitive the needle reads high. The idea
then is to add back the lost weight. This person recommended a small
dab of finger nail polish.

The last choice is to send it back to the factory which I would rather
avoid.

Thanks.