Thanks for the quick reply. I want to make sure that I understand you correctly.

This is the top of the rear sight looking down on it:

/ \
| |
| |
| |
| |
| |
| |
|__| <---- tap here?


Doing this will not make the sight loose?

I assume that this is something to do at the range so that I can see how each adjustment affects the aim.

Thanks!