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I noticed that I had 4 missing from my engine bay, no ill effects whatsoever. However like Panthera and WSN am a bit OCD, was foolish enough to buy a pack of 10 from main dealer which including my discount came to less than £20 delivered.
Know they're cheap enough but if anyone in the UK needs a couple of spares I'll be happy to post FoC
I wonder when, I have those cowls/covers hydro-dipped whether to to have the retainers done at the same time, or leave as plain black for contrast...bit of a dilemma!!??
they're clever in a lot of ways. a normal rivet design would require two pieces, and the bottom one could fall out, into the engine bay in this case. a screw threaded in over and over by anyone regardless of skill/profession, over the life of the car, is subject to thread wear. that would ruin the dust/visibility shield, or some part of the frame, as well as the screw if they mated directly. both of those concerns would be made worse by using metal (not to mention it's more expensive and cost-cutting here is no big deal), but since it's plastic instead, the head of the screw would then round off easy in a socket, too. so you've probably seen these trim fasteners on a lot of cars:
they were the ideal solution for some time. saab, volvo, volkswagen, i think audi, and really probably a lot of other manufacturers have historically used these on the outside of the vehicle for trim and wheel wells and such, exposing them to road salt/sand/grime, and they're usually a tiny torx driven screw as if to say "yeah, sorry, but at least it's not 4mm hex." i bet they're still commonly used to mate exterior parts because i've found one or two in my nissan as well.
the scrivets solve several design concerns at once. they're two-piece but captive so nothing falls into the nether and rattles around or finds its way into a belt, because they're internally captive they also wear themselves and not the parts they hold together, and you can use your fingers instead of a tool. i have a hard time trying to conjure up something better.