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The 4th one which would be the tone pot for the bridge pickup won’t fit in its hole with the can on it-it would hit the edge of the body. These are called shielding cans and their purpose is to keep the pots from being affected by various forces-like power sources, magnets and so on. You can see that 3 of the pots have a cover on them. This is something you might want to think twice about before your curiosity gets the better of you. The harness on these early 335s and the most recent Historics has to be installed through the f-holes. These have no cutout in the center block-put there by Gibson in 65 to make getting the harness in much easier. Once you get the hang of it, it isn’t that hard to get back in on a 335 made after 1964, unless it’s a recent 59 reissue Historic. You do not want to take out the harness on a 335. Want to see the harness on a 335? No you don’t. While most of you have seen a wiring harness, it’s probably been from a solid body guitar like a Les Paul or a Stratocaster or an SG-guitars which are easy to put back together again. Most of us took stuff apart as kids and only paid the consequences when we couldn’t get it back together and Dad was due home at any minute and his lawnmower was in 150 pieces on the garage floor because you wanted to see what the inside of an engine looked like. It’s a natural urge for guys and maybe for women as well. Most people have seen the wiring harness of a guitar before-usually because they want to go snooping around to see what makes the thing tick.