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Gnomoney This watch holder is bigger and beefier than others in the marketplace. suction cups are bigger and stickier. One suggestion would be a leash or a loop to attach a leash.
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LauraJ I'd made bootleg versions of these with PVC pipe, 20+ years back. The key is good suction cups. These stick perfectly on my NK K1, Nelo Viper, and husbands Fenn. Keeps my head up, while doing intervals or just doing an LSD cruise. Fun colors, too!