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STA
Wing
Backplate
Washer
Lock Washer
Wing Nut
Ideally you replace that hardware with one of these
DGX 5/16-18 Delrin Thumbwheel Nuts, Set of Two | Dive Gear Express®
or these
Dive Rite Scalloped Delrin Thumbwheels, Set of Two | Dive Gear Express®
Ideally you replace that hardware with one of these
DGX 5/16-18 Delrin Thumbwheel Nuts, Set of Two | Dive Gear Express®
or these
Dive Rite Scalloped Delrin Thumbwheels, Set of Two | Dive Gear Express®