0 of 1 people found the following review helpful
Threads on light do not work well,
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This review is from: Lezyne Femto Drive Cycling Light Set (Misc.)
The threads screw in aluminium to aluminium so any deviance in the manufacturing process renders the light unable to screw onto the battery holder.
Mine were poorly threaded and took a long time to screw into each other. Didn't function well.