Im tryna understand these things. i know their fairly simple , but ive never used one nor seen one deployed from aboard a yacht.

Im guessing that when you want to unfurl, you pull on the port or stb jib sheet to pull the headsail out.
What about the rope around the drum? do you keep tension on this as you unfurl?

How do you unfurl? is there a mechanism inside the drum that when you give a lil tug on the sheet in the drum, the drum rotates, winding the sail back up??

i know it sounds dumb, but im just tryna get my head around it. I like to understand stuff.