| Diagram | Fig. 16 — Swinging Arm, Suspension Units, Chainguard · ref 5 |
| Subsystem | primary |
| Listed in parts books | 1975 |
Norton Welch Plug (Zinc Passivated "Gold" Finish)
A small gold zinc-passivated Welch plug, PN 06-6623, used to seal an opening in the swinging arm area.
This is a Welch plug listed under Norton part number 06-6623, finished in a zinc-passivated gold coating. It shows up in the swinging arm, suspension units, and chainguard section of the parts book, where a small blanking plug like this typically seals off an open-ended cross drilling or casting hole so dirt and water can't get into the pivot area.
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Welch plugs are simple pressed-in discs, not threaded fittings, so there's no torque spec or thread size to worry about with this one — it just seats into a machined bore and stays put on its own once tapped home. Ours only turns up once in the catalog record, tied to 1975, so we don't have a broader year range to pass along beyond that.
If you're replacing one on a Commando swingarm, check the size of the bore it's going into before you order, since Welch plugs come in a range of diameters and the catalog entry here doesn't spell out dimensions.
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