I have a fix that plagues 70's.
Many times the rear pins will not go on spot even with the table flagged and as far to the rear as it will go.
My fix is to take the spotting cup cap and cut the keyway where the shaft key goes in and cut the groove 10 degrees off parallel to square on the modified cap.
This will allow the cup to have more rearward adjustment......the longer cup bolts do not work.
JK
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