The clutch mechanism has been changed three times.
The first production version can be seen on the both pictures on the right and below. On the right the explosion drawing from the parts catalog, below the gearbox cover with the seat bearing of the clutch lever.
The both push rods (a little steel ball is separating them) were changed first with the engine no. 664 (we’re talking about engine numbers because the gearbox has no own number). The next change was with engine no. 2286. The push rods thrust bearing was located in the clutch thrust plate, which also was changed each time.
All these early clutch mechanisms had some problems, obviously caused in the thrust bearing.