Happy to add the drawing of these two adjustable CC-SP designs here... its been a while researching thesetime for some more pics,
def. CC did so much more than s.posts but none the less it was his first step into the bike business before he became sought after for his frames.
here are 2 examples of what charlie fabed up before the brilliant "fasp" design
fotos are of the f.book depts n archives
(btw these first 2 images show what had been described on previous page here in what Charlie called "handmade" adjustable friction held posts)