I am also interested in these shafts, there is a guy on ebay that is selling new scratch wedges with this shaft and didn't know anything but here is a link:
seems to work if believe the numbers....
Spoke with a rep this morning about these wedges and I have to say I'm impressed with the level of customer service, I was slightly confused by what the website was telling me but after a good conversation I think I'm straightend out now. One question I still have is which one 8620 or 1018???