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At one time, the three lower screws were identical, and a shallow notch cut in the grips to accommodate the head of the rear one. Then they began to make that screw with a flat head, so its place was now obvious, but the other screws were still identical. Then they decided to use a different size screw for the front, where it is also the retaining screw for the crane.
Even when the screws appear identical, one has a flat point at the side of the tip, and the tip itself may be a tad shorter; that is the front screw. If another screw is put in its place, the crane may bind and the cylinder will be hard to open.
Jim
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