Zactly, as it's related to the topic and how the Mattel wheel was put together, I was wondering: " "mag" wheel was a cast aluminum piece. It was riveted at the five contact points to a Murray steel rim"
I guess it's possible on monkeey bike but, gots a feeling Monkeey's Unicycle could be whole piece aluminum or? cast. Reminds me, my brother and I was messing around near Azua on a Sunday, a small factory, (unlocked storage yard back then) setting out were small Mag wheels but think for Go-carts vs bike, they could have made that unicycle wheel. Mattel factory and extra wherehouse wasn't far from where I grew up. And Azusa had plenty of Start-ups where, prob manufactured for Mattel. If Mattel factory trashed them, then, behind my house in the hills was La-Pu (La Puente) City dump. Mattel's environmentally unfriendly trash pit. That's where it's all at. Everything U can imagine, until 1969/70, reject, discounted Etc. Mattel is in there. . Directly, I might add, under the Hilton hotel they'd put, I believe, to hide the toxic waste in there. In that dump, Toxic is being polite as some summers there were self-ignited explosions.