I had a strange thing happen. My battery went dead awhile ago, and I charged it. Apparently I didn't tighten the black hex-head screws under the chrome faux air vent enough, because they rattled loose. I went to the hardware store and bought two M5 .80 pitch screws, after comparison to another Triumph factory screw. Oddly, they wouldn't thread into the brass screw fittings on my bike, despite the fact that the M5 nuts at the store threaded onto the Triumph screw. I returned, and bought two 10-32 screws in 3/8" length, and they threaded into the holes. I added some split lock washers to ensure that the problem won't repeat itself.
So....any ideas why the M5 screws don't fit in the holes, but the standard do? I have seen the dimensions page that lists everything as a metric screw. Thoughts?
