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si_mon628
I decided to reduce potential road noise from grit/spray flying against the Bob Yak trailer's alloy mudguard by applying underseal. Some searching of forums, mainly for motorcycles, suggested 3M rubberised underseal and I bought 3M Car Body Schutz 08877 in aerosol, the type available in Europe. After 4 coats, it had built up a 1mm layer. When dry, I stencilled round the inside fittings and cut out the rubber so that they mounted firmly against the alloy at the attachment points.
I swapped in a B&M Secula Permanent battery-powered light which was a similar size and orientation to the original passive reflector, shortening the upper mounting screw to the same length. It required a small amount of black Sugru to fill in a gap around the slightly narrower lower mounting pin which prevents the unit from twisting off centre. It was rather too easy to turn on so I took out the black button, which has a length of plastic rod that operates the unit's switch. I removed a fraction of a mm off the length of the rod using a sharp blade, before refitting it. A very slight lengthening of the rod, by gently pulling it with some narrow pliers, resulted in the ideal force needed to turn the light on. The Secula offers a wide field of view and it provides helpful sideways illumination for nighttime trailer use.