Hi Matagi
thanks for posting.
it's really tricky to set the seat position on this thing because without your weight on it, everythings in a different position. It is not actually bouncy unless my husband and i are out of cadence. (hard to explain) but when it starts to happen i ask him to go to a higher gear and the problem goes away.

Unfortunately, we're stuck with the thing.
For earth day (saturday), we rode 34 miles and the Terry butterfly just puts too much
pressure on all the wrong stuff. my sitting bones feel bruised.

I have decided to buy a B67 Brooks, which is the modern fitted version
of the saddle that I have.
I'll let you all know what i think of that one.
Thanks to those of you who suggested Wallingford Bikes, I wrote to them
and they were MOST helpful.