'A' - the flanged tube presses on the clutch operating fingers to release the clutch pressure plate. It is a press fit inside the bearing 'E' and is held in position by the circlip 'B' which sits in a shallow channel in 'A'.
'C' - notch nut which, with washer 'D' attached, holds the bearing 'E' in the casting 'F'.
'F' - bearing case - the line from 'F' points to the oiling hole (for lubricating the bearing) which is supplied by a drip pipe from the one-shot system.
'G' - universal joint - the line from 'G' points to 1 of the 2 pivot arms that locate in the clutch cross-shaft fork (see 19th March).
'H' - 2 split pins hold 'G' in position - all pressure is obviously forwards (r-to-l in this picture).