Where can I adjust retention of holster/pouch?

There are specific places where you can adjust the retention of a holster or pouch. The principle of operation is the same: if you tighten the screw, the retention getting harder, unscrew it, retention weakens.

Below are pictures showing such places.

1. Holsters
   
   
2. Double Pouch (do not touch a screw under red arrow).
   
   
3. Single pouch
   image coming soon