Michael, the front has two metal rods that run inside the wood of the front standard threaded at the top with a thumb nut and a plate at the bottom that locates under a brass rail. When you tighten the rods the Front standard locks in place, when loose you can slide and position it by hand, you still have front and rear focus as well. To fold you push the standard to the back of the camera where the brass rails finish and the standard is then loose and you can then fold it forward.
This is a half plate camera using the same system, shows it more clearly than a description One of numerous restorations awaiting new bellows.
Ian
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