Spinning Wheel - Flyer with sliding hooks

As of late 2007 Louet started shipping wheel models S10, S10DT, S51 and S51DT with flyers that have sliding hooks: same as the high speed flyer. 

INSTRUCTIONS TO TIGHTEN SLIDER HOOKS

Remove the slider from the flyer. Position the pliers so that you have a secure grip on the wires. Gently squeeze the wires together, slowly ( if you squeeze too hard or fast you could break the plastic and they will pop out of the pliers). Put the slider back on the flyer, if it’s not tight enough, repeat the process.

Below is a video that shows this process.