Sean, I checked a set of levers real close and couldn't find a ridge or step inside mine, but, they slid side to side about 1mm each way. I don't think they would ever fall out in the parts box, and for sure never with a cable hooked up. I would put a twist tie on them untill ready to use and forget it. Dickey Greer West Monroe,La USA
I received a set of Nuovo Record brake levers and the barrel that holds the cable end, which campagnolo refers to as the "cable nipple holder/part no. 2035", is on the verge of falling out.