Helmet Mirror Mount: Elevation Set Screw Slide

The elevation tension adjustment on both our bike helmet mirror mounts have become a bit sloppy. That’s no surprise, because I expected the tiny set screw in the tiny square hole near the top to eventually wear a depression in the ABS plastic arc upon which it bears:

Helmet mirror mount - 3D model - Fit layout

Helmet mirror mount – 3D model – Fit layout

The only surprise was that it took four years. That’s far longer than all of the commercial mirror and their mounts lasted; this one’s definitely a keeper.

So I got to do something I planned pretty much from the beginning of the project: cut a snippet of phosphor bronze spring stock to go between the Elevation mount and the arc, then bend the ends bent inward so they don’t slash an errant fingertip:

Helmet mirror mount - elevation slide

Helmet mirror mount – elevation slide

Slipped in place, the ends look like they stick out anyway, but they’re really just about flush:

Helmet mirror mount - El slide in place

Helmet mirror mount – El slide in place

Tightening the set screw pushes the strip against the arc, where it provides enough resistance to prevent slipping and enough smoothness for easy adjustment.

While I had the mounts up on the repair stand, I unscrewed the mirror shaft and snugged up the Azimuth pivot screw by a micro-smidgen to tighten that motion.

Four years ago, those ABS parts popped off the much-hacked Thing-O-Matic’s platform. The M2 produces somewhat better-looking results, but that yellow plastic has a certain charm…


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