Interesting-- the reason I ask is that on my current B66 (which I got some years back) the front vertical bolt is a bit loose. I'm not sure if that's supposed to happen or not. There seems to be no way to tighten it. My fear was that my riding position had caused too much weight on the saddle itself and damaged that front bolt. Is this a common thing or is it a problem with the saddle?

The saddle will have a traditional Raleigh type saddle bag attached. I'm not sure if the large double action springs on some of these prevent that.