There are 6 of those Chromed plastic caps (snap caps) on my trike that I usually end up regluing the snap caps back in place with silicone as they "fall off" … I am thinking I might just get some button headed socket screws in stainless steel to replace them with. Chuck the screws in a drill to polish the heads, no more gluing or snapping snap caps on & off, or rather "off & on" I guess? I'm thinking a 6mm. Maybe just some Philips head screws?