Northwest cable backhoe excavator

Hi, I'm a newbie. Can anyone tell me how a vintage (1954) Northwest Engineering cable back hoe excavator operated? The one I’m interested in can be seen at: I’ve a great little HO scale pewter kit of this by Custom Finishing of Orange, MA and I want to motorise it. The instructions mention a) bucket crowd cable installation, b) boom lift and dipper extend installation, and c) elevator column cable installation, but i

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