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Did that last summer, but did not think to take pictures and the boat is sealed up under the snow. A couple of pointers:
1) Get a hole saw of the correct diameter, a 12" drill bit extension and make a jig to approxomate the angle of the holders. You need to use the jig to angle the hole or the holders will not sit properly
2) Remember the sidewall angles away into the boat. That means you can not plan on the flange sitting square on the gunwale. It will be turned slightly. Be carefull not to drill through your sidewall. Drill a bit, remove foam, check and then drill a bit more.
3) Use holders with a small oval flange. I originally ordered the rectangular Perkos, but they did not fit once I twisted them to clear the sidewall issue discussed above.
4) Go to the hardware store to plug the bottom. I found a threaded insert the loosely threaded into the bottom of the holder. It accepted a smaller threaded insert, that accepted a threaded barbed drain. I put all that together, sealed it and sealed the daylights out of it inside and out on the holder. I created a pocket in the foam under the holder and drilled into into it from inside the boat just above the lip on the inside wall, put 3' of 1/4" plastic hose on the holder, worked it through the hole in the side, cut it shorter, put another barbed plug on the end. Pushed the excess back into the sidewall and sealed it all with Rule top and bottom. Any water into the holder now drains right out.
Hope that helps.
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