Dartswinger70 said

Yes, in a slave cylinder system the clutch will work untill the disc wears down to nothing, like brake pads, then the pressure plate spring loaded section moves closer to the flywheel, pressing on the worn thinner disc, The slave cylinder pushrod cannot move the pressure plate far enough to disengage the clutch, because the disc is worn too far. it looks to me like your clutch fork isnt moving enough to disengage the clutch, which is why the driver had to "hard shift " it without a clutch to move it.

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