The sight glass installed easily atop of the feed tube. Unfortunately, the oil flowed down one side rather than as a stream down the center. Upon inspection it appears the oil is hitting the o-ring for the glass window.
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The ID of the brass elbow is 0.3125. A piece of copper tubing would be idea but everything I had on hand was the wrong size. So I turned a tube extension from a scrap of brass. It only took a few minutes. Here I'm parting off the tube.
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These are the parts after cleaning in preparation to be fluxed and soldered. The fit is a snug sliding fit which should hold it in place during soldering.
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