Early guns have the long rear screw like in Jacks photo. But later guns have a short rear screw (which is the same length as the front screws). On these guns, the rear screw was marked with an "X" on the bottom.
And then Jack says left side for the "-", he means left side of gun, which is your right side when you are looking at the bottom working on the screws.
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B. Dudley
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