Good question Al.
The short answer is the ProtoHands will not stay connected without the magnets. For a little background please see link for ProtoHands instructions: http://oldirondesigns.com/mounting-instructions.html
A non-magnetic version would be a different product and there are several issues:
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it would take two hands to connect them (twist them together).
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controlling the physical clamping interface so that the glad hands stay connected, yet reliably release (pull apart) when cars are uncoupled.
Real gladhands are connected with the hoses at 4 and 8 o’clock and are twisted together until the hoses are at 2 and 10. The gladhands literally wedged together with increasing pressure as they twist together. This compresses the seals. When cars are uncoupled, the hoses straighten out to 3 and 9 o’clock position, the clamping pressure is reduced and they pull apart without ripping the hoses off the car. It is an ingeniously simple design, but the “physics” don’t translate when reduced in scale to model size.
I do have an answer for turning engines and/or cabooses that will allow mating to the ProtoHands on either end of a train. If plans works out, I will soon announce the availability of special Engine & Caboose ProtoHands with a steel disc instead of a magnet. The ProtoHand with steel disc will be attracted to the magnetic ProtoHands on either end of the train (regardless of polarity).