A:
There is a hook that the line goes through once you set the depth which makes it so that if line is to come out, it spins the spool. The spool is connected to a shaft that runs inside the outer shaft and is sealed up with grease so no water gets in. When the spool spins, the 'T' at the top spins and lets the flag up. You can see the T spinning from a ways away if the fish is running. If you're using large bait it's tough to set drag on this model, you can kind of wedge the line into the loop to keep bait from running and moving the spool, or you can use a clothespin or an elastic. They come put together, just add your backing and leader/hook, unfold, bait the hook and fish.