Strain Relief - Metal Small K series It is the wheel-style control

It is the wheel-style control you turn to raise or lower the brush head

adding stress to the joint

they should still be inspected periodically for cracks or worn teeth

This Wessel Werk Rug Tool - 1 1/4" - 11 1/4" with Wheels and Rubber Bumper is a replacement floor cleaning attachment with natural or synthetic bristles for effective cleaning on hard floors and area rugs

and split where they flex

Strain Relief - Metal Small K series It is the wheel-style controlThe metal strain relief in the small size (Part #SR37) is a universal fit cord accessory used in vacuum repair. It secures the power cord where it enters the housing to keep tension off the internal connections. Without a strain relief, every tug on the cord pulls directly on the wired terminals inside, which loosens connections and risks a break. A metal strain relief clamps the cord in place so the internal wiring stays protected. Fits: standard