How to dismantle Campag Ergolevers (hex key won't turn) Following my recent question Overhauling 1998 Campagnolo Chorus Ergolevers, I attempted to take apart the right hand lever. But I got stuck at pretty much the first hurdle: undoing the bolt that retains all of the inner workings. Using two hex keys, one from the back and one from the front, and lots of force (enough to round off a cheap hex key!), the bolt would not budge.


Am I doing something wrong? 
Is there a known problem with these sometimes seizing? If so, any ideas about freeing the seized part?
From my experience (see below) since asking the questions, the answers are:


Am I doing something wrong? NO
Is there a known problem with these sometimes seizing? YES - known now by me!
If so, any ideas about freeing the seized part? YES thanks @ojs for the suggestion.


My experience was that I broke the plastic body of the lever. This was because it was held in a vice and I was putting a great deal of torque (lefty-loosey, thanks @haniel-r-hicks :-) ) through the seized bolt in a last ditch attempt dismantle it.