Here's a different take.....
Like most tandems with an Arai drag brake, ours originally used a bar end lever.
However, for my young daughters (two of my three available stokers) the leverage required was difficult for their small hands, producing insufficient braking on descents, so for a solution I had to think out of the box.
This is the modification I made. It's a short-reach flat bar brake lever. The cable pull is perfect and it provides better modulation and greater pulling pressure than before, especially with an adult hand (when my wife is stoking). With a child's strength the braking is as good as an adult pulling on the previous bar-end lever.
