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Skink,

I get your chain of thought, and obviously, no - lead is lead.

But if the issue of its prohibition is safety, it loses that issue if the kids no longer have direct contact with it in the operation of the machine

Thanks for your thoughts

OK - no lead objects

But it is a great material for weights

Is it a lead object if the lead is fully encapsulated, i.e, a plexiglass box, massive duct tape surround, such that outwardly, it has no attributes as lead ?

What about designing gears and a using 3-D printer to create? designing them would make them homemade.