Are you moving it up and down to "find" the hole on the inside?
The first time I re-installed the axles on my 12 bolt, I had the same problem. I found that you have to "thread the needle" on the far side of the axle tube, and that it takes some wiggling.
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 1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461.
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