I lost 1 gimbal knob on my Helix 10. Ordered 2 new sets (always some backups) and secured them. Drilled a hole in the knob, attached a swivel with a pop rivet, connected them together with some paracord with heat shrink tube on the ends, paracord threaded through a short black plastic tube which is mounted with hot melt glue to the finder.
Swivel lets the knob turn without twisting the cord. No more lost knobs. Any "removable" part like this should come with a keeper from the manufacturer.
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