Have you tried tightening the bolt on the side of the shifter that goes into the braze-on / band - is it a problem with the lever itself not being held tightly enough? The well known story is that this used to happen with older Campag shifters, which was why lots of the peloton used Simplex retrofrictions.
Have you tried tightening the bolt on the side of the shifter that goes into the braze-on / band - is it a problem with the lever itself not being held tightly enough? The well known story is that this used to happen with older Campag shifters, which was why lots of the peloton used Simplex retrofrictions.