Figured I'd share this for safety's sake. A very cheap and easy safety I add to my dispensers. It can be fine tuned so the handle can't fully depress and only depress so far to release as little/as much as you want. I don't think I need to explain since a picture is worth a thousand words. As always, results may vary. Stay safe!
**Edit** Should have added this as an FYI, the higher quality dispensers usually let you remove the handle for easier drilling of the hole.