Here we go again...
Inside the female socket of the front half shaft is a 'keyway', more a space (see 'A' on the photo below, and the black mark 'B' on the outer edge).
On the UJ at the front end of the rear half shaft there is a cast 'button' (see 'C' on the second photo). When you get these lined up not only does it fit together easily but the two shafts will be back in their proper, balanced alignment.
It is very easy to kid yourself that the shafts are properly marked for later assembly, but lining up the button with the keyway is pretty foolproof.
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