You remove the center dust cap and the moon hub cap mounts in that hole with spring loaded plastic prongs (if you can imagine that ).
It takes like 30 seconds, srs.
I had one for a couple years.
You can't mount it on the rear wheel because the rear wheel doesn't have that hole (I 'was' toying with the idea of custom mounting one but never got around to it.)
You have to check it from time to time, I lost mine over some bad road on a freeway, but only because it must have already worked itself loose a little.
It was like $45 from S.W. but that was in 2001....
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