(above, re handle): With aero bars bolted around my handlebars in same position as your extensions, to release the lever, I always need to push it up from in front and below, between the aero bar tubes. Easy. Then I fully retract it from above. Also, it really helps to lube the lever cam area with some anti-seize (me) or grease. Mine has a tiny copper sheet between the lever cam and handlebar clamp, I put the anti-seize on top between the lever cam and copper, where it slides. Clamps just as strong and lever stays put, but greatly reduces the lever force needed.