JMC810 Folding Instructions:

When opening and folding the camera it is best to have either the front or rear rail pulled out a small amount (2 -3 inches). This will prevent the front standard rise and fall rails from dragging on the bellows. The two sliding bars on each side of the lens board frame are used to lock the front vertical shift. Slide these into the slots on each side of the rise and fall rails on the front when you open the camera. When you fold the camera move the front standard as far up as possible and then disengage the two sliding bars. Unlock the base tilt knob on the front standard. Rotate the front standard down into the bed. Unlock the rear base tilt, and rotate the rear standard down. Tighten the rear base knobs, and connect the strap under the camera.

You will find reference marks for the lateral shift center, and to center the lens for the rise and fall. The following sizes are of hex keys (Allen Wrenches) used on the bolts of the camera: 0.050, 1/16, 3/32, and 1/8.