Need to check a couple of things.
Measure the diameter of the spigot on the end of the gearbox shaft, and the diameter of the bush in the centre of the flywheel - they should match, with the shaft slightly smaller. Possible problems are a burr on either part or there is a bush stuck on the spigot, or wrong bush. Ideally need inside and outside calipers to measure this.
Check that the clutch plate easily slides on the shaft - wrong plate?
The plate needs to be the right way round, and correctly centred using a suitable alignment tool.
If all this checks out, a big help is to temporarily replace three of the bell housing to flywheel housing studs with long bolts with the heads cut off. This will ensure everything is correctly aligned before you get to aligning the bits you can't see!
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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