Is it a getrag?
I found a pic on the net of a getrag and I could not see an external adjustment.
Sometimes there is an adjustable threaded rod between the slave cylinder and the fork, but unlikely in this case, looks like a similar setup to my old HK holden on those you adjust the clutch fork pivot ball (in the bell housing) to move the fork and bearing in or out. See if you can borrow a maintenance manual.
I found a pic on the net of a getrag and I could not see an external adjustment.
Sometimes there is an adjustable threaded rod between the slave cylinder and the fork, but unlikely in this case, looks like a similar setup to my old HK holden on those you adjust the clutch fork pivot ball (in the bell housing) to move the fork and bearing in or out. See if you can borrow a maintenance manual.