the way those work is this way....

pull them out toward the edge, not all the way off, but just so they slide freely. Then the centrifigual (spellling??) force will pull them out to slow the spin of the spool. To reduce the braking power, push them into the middle, where they will click in place, and then you lock them into the middle, and they don't provide and braking assistance.

I hope that helps.

Danny