Hi tiompan
Found this picture of the Devil's Den by WS
http://www.themodernantiquarian.com/post/66677/images/devils_den.html
Some books I have read say the capstone was re-erected in 1921 at the same time as the uprights were re-bedded and reinforced with concrete.
Haven't found anything on any finds just yet but I will look tonight unless somebody else can enlighten us.
:o)
Scubi