I bought a stainless steel marine grade one from a chandlers near where I live. It's mounted on the front consul so handy for GPS etc. It's pretty much out of the way of any rain blast and seems to work well there.

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www.reeves-cartoons.co.uk
centrestand, handguards and deflectors, scottoiler, handlebar muffs, panniers, cush drive mod, compass, power socket,
petebog rack, handguard extenders, satnav, tank bag...to be continued