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rodabod
The reason I used a front derailleur shifter is because it is made to go on the left side of the handlebar. So the exit cable follows the same route as the original 2 speed Brompton shifter. Also, the shifter I used is an older Suntour, and it is not indexed- meaning it is a friction shifter. Any friction shifter will work, cable pull doesn't matter with this kind of set up. One point I failed to mention in my earlier explanation is: if you use a non Brompton shifter, you will have to install a cable stop on the spring end near the changer located on the right chainstay. You can find these on eBay if you look hard, or make one like I did. It is basically a 10 mm bolt (that replaces the Brompton one) with a hole drilled through to accept the shifter cable and a set screw to lock the cable down.