Metal Trucks for Windmill?

Hey there! I am going through various letterpress parts and equipment, while doing this I stumbled across what looks like metal trucks for a windmill press? Your thoughts? I haven’t put them on for fear of ruining the rails of the press. This is just a odd find any answers would help my mind rest. haha! Thanks!
-EJ

image: trucks.jpg

trucks.jpg

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Avoid this metal runners which will run in both sides of the rubber rollers of the platen.Please give this metal runners to your lathe enginners and tell them make the same in nylon rods.which will not spoil the side bars.