I will go take a look at the review - yes they do need tapping to fully seat them, but I found it somewhat counter-productive to try hammer them on when they weren't on in the first place. If you can get the gears onto the hexagonal shaft then job done - just gently tap them down.
It was getting them on the diff outdrives in the first place that I found a little tricky but try line them up with your eye and then go easy on them and try make sure they're going on square - push 'em with your thumb.
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