Knott, I needed to be able to push my B72 on my touring bike back about a cm. and finally found a solution. Clever Cycles recommended the Brompton saddle adapter pin, so I switched to that coupled with a straight seatpost. I've only ridden it a couple of times so far but the times I have been on it my right hip and knee have been so much happier. And so has my pocket book! The lugged seatpost with extra setback at Riv is a looker but more than I wanted to spend.

Taken from Cleverchimps flickr page:



Link to Google products page:
http://www.google.com/products?addr=...wQrQQwAg&sl=on
You might try asking if your LBS can order it for you or see if one of the folding bike shops have it in stock.