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On a Brompton M type Handlebar there is not a lot of space to install cycle computer, smartphone, front light etc.
This extender bridge, crossbar takes place in the middle of the handlebar. You just have to snap it firmly onto your handlebar. If necessary, move the shifters before snaping the extension and replace them after at the same place.
You can add double tape for a better result.
This extender works with olders shifters 3/6 speeds and 2 speeds with olders brakes levers or newer brakes (thoses without shifters) .
The engraved O must facing you when you're on the Brompton
Diameter is standard 22.2mm.
Disclaimer: Do not grab this bridge to pull/lift the Brompton, or add a heavy handlebar bag onto, it was not designed for that.
This extender is for older Brompton M handlebar (pre 2017), just check before.
Updated 15 May 2018: Length adjustement