I completely removed the original deck drain from my ‘79 Sunfish because it was corroded beyond repair on the inside of the hull. I have since made some minor repairs to the opening and filled the original pin holes (one was compromised during the removal) with Flexpoxy. I have sanded and prepped the opening, and dry fitted the new plug. The new plug from www.sunfisfpartsdirect.com came with two pins, but it has 3 holes on the flange instead of two as shown in the picture from their website (below). I’m assuming the third hole is just an extra/optional hole in case placement is an issue, but I’m curious to hear what y’all think? Also, do y’all have any advice on what size drill bit to use? Thanks.