Removing Seat Back Adjusters

Hi Folks,

I have a '71 standard beetle and I am reupholstering all the seats. I
have disassembled the front seat backs and bases and I am preparing to
sandblast the frames and repaint. My problem is I can't seem to figure
out how to take the seat back adjusters (recline) out of the seat
base. There is a knob on both sides that turns to four different
positions and in each knob there seems to be a pin with a head on it.
I can't see a hole on the other side of the pin so I can't figure out
how to drive it out. Does anyone have an idea how to take this apart?
I don't want to sandblast that area without removing the mechanism
because I think it will just get all jambed up with sand.

Any help is greatly appreciated. ;-)

Scott S.