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I suppose the depth would be useful to know also as it might need the bolt hole opening up to take a trad seat bolt.
It's tiny. If you open up the mounting hole large enough to fit a seat clamp bolt it will cease to be a hole.
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August bicycles was selling a widget to do this with Thompson seat clamps
Brommers
Belagerent
@jameso
Got 2 bikes with full F+R dyno lighting now, both using SON lights. One needs some refinement in the rear light positioning. The Supernova E3 rear light with the seatpost mount, does anyone know the thickness of the strut at the rear of the light where it mounts/pivots on the seatpost-fitting part? I suppose the depth would be useful to know also as it might need the bolt hole opening up to take a trad seat bolt.
I was hoping it would fit in the gap at the rear of a set lug, it would put the light in a good spot. A thin rubber washer should let it stay in position w/o the seat lug and bolt binding when done up but it depends on the strut width. May need some filing.