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https://www.sjscycles.co.uk/mudguards/brompton-mudguard-stay-anchor-plates-inner-outer/
I've used one of these on my front rack, just need a long enough bolt to space the light away from the stays but does hold the light securely.
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If you can measure the widest part of the flattened section I'll compare it to the Nitto lamp holder in my parts box.
I've used this style of tube clamp to mount lights previously FWIW: https://hollandbikeshop.com/en-gb/bicycle-parts-city-bike/luggage-carrier/tubus-luggage-carriers/tubus-carrier-parts/tubus-clamp-set-pannier-rack-silver/
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P-clamp with a long bolt (probably 40-60mm or something, and lots of old v-brake spacers to get it in the correct position, maybe some serrated washers if you're feeling fancy. Just the actual bolt going through the dynamo light mount hole, assuming it's a standard one which is 90° to the direction of light. It can actually look pretty tidy if all lined up nicely.
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There is a useful ancient ESGE thing out there that has a grippy conical nut that can attach securely to racks. SJS sell another thing (meant for a dynamo) with two grips, it's rather wide at 50mm, maybe adaptable for a light on rack tube? I have the ancient thing specifically for this, works very well but they're gone. I feel like I bought a spare but I have no idea where it is :/
Also there's this? Might be that you could grip a rack tube with it. https://www.sjscycles.co.uk/dynamos/busch-muller-high-quality-aluminum-stay-fitting-bracket/
Looking for bright ideas for dynamo lamp mounting on a rack with no eyelets. I wish I realized this before I bought it.
Soma demi porteur, wtaf.
Anyway, has anyone got any thoughts? I was thinking maybe a pclamp off the front loop and an upside down edelux, or some kind of lamp holder off the strut leg and a regular lamp.
I see the nitto lamp holders which look ideal, but the attachment bolts seem to be made for circular struts and the soma has a flattened strut end, doesn't look like you'd be able to slide it on.
Any ideas most appreciated.