Here’s a set I made a few years ago after seeing Gevenalle’s offerings. On theirs the levers generally aim down and the housings aim upward. On mine these are both reversed. I attached a machined stud to Tektro levers from the inside with a screw. They work pretty well, I just don’t have a bike needing them now. I run Gevenalles on the gravel bike and like them a lot.
