The Manutec grub screw handle once tightened locates into a drilled hole on the jockey wheel worm drive.
The worm drive is hardened steel. The Manutec handle rotates the worm drive to raise or lower the jockey wheel.
Another option is the roll pin model that fits worm drives with a smaller hole. The old roll pin can be pushed out with a punch or a nail with the point ground to a flat.
Manutec jockey wheel handle models have a larger diameter roll pin than the comparable le Manutec model.
Nut and bolt Handle is used on jockey wheels that have a hole through the worn drive.
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