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The large hole is in the rear of the case. The spindle has to go in from the rear, with the large end going in last.
There's only a few thousandth's difference between the large and small holes and spindle ends. Only the rear 3/4" of the spindle has the larger diameter. It's designed to be an interference fit once it's all together, so you will have to tap it the final 3/4" -- sometimes a fair amount of force is required; you'll need something more solid than a rubber mallet.
It should all slide together by hand, although snugly, until you reach the interference point. You can usually identify the large end of the spindle from slight wear marks where it was driven in.
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