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I first marked and drilled the holes in the vent. Next I clamped the doubler to the vent and match drilled the doubler. They are both done in the third picture.

The fourth picture was odd.  I came out one day and found this puddle under the compressor.  I thought my drain valve must have malfunctioned, but when I opened the valve some residual pressure was released along with a good bit of water. Since it was raining out, I thought that some water must have got under the door. However, after a few hours it wasn’t evaporating and the compressor was dry. It turns out that my bottle of pneumatic tool oil had gotten knocked over and drained onto the table and down the table leg. The oil flowed under the tank and fooled me into thinking it was water.  Some ail dry took care of the mess.