The bolt was OK, the wire though was broken. Maybe the bolt damage the wire when it was tightened.
Anyhow I got the opportunity to see how the RR 1 is built. I also disassembled the driver unit. Spacers seem to be about 1.3 mm thick and the sound when knocking the diaphragm it sounded about right. And yes, everything is easily accessible, except the pads maybe.
Bottom line: I like the design.
P.S.
As the original pads were removed I took a pair of 007 pads