When taking out the rear drain plug (next to the rudder) on my islander, I noticed a certain difficulty, and when I went to put it back in, I couldn't do so because of the holes being almost completely stripped! I ended up re-inserting the plugs with the help of a wrench, and have had to use a hand pump to drain the yak ever since... I’m thinking about installing a separate drain plug, but am wondering if it’s worth the trouble, or whether I should just stick with the pump…
I have also noticed this problem with the seat drains, but I usually leave those open, since I'll end up soaked anyways.