Every one of mine, large and small bronze perko, simply came out with a slight turn with a nipple wrench (fits inside thru-hull and grabs the two tangs there) and a monkey wrench on the inside. One of them unscrewed by simply turning the nipple wrench. One of the large ones only had 2 3/4 full threads holding it. The whole episode was very frightening for me because of how easy they came out. You can cut or grind a piece of metal to fit inside a thru-hull as a nipple wrench then have someone inside with a monkey wrench or jam it somewhere as I did and do it alone.
Ken
Taking what comes as I get it, using it all as much as I can and trying hard to leave all the shit behind.
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