www.faysboatyard.com/service/chandlery-the-ship/ in Gilford on Route 11 has maybe six different styles of nylon drain plugs for small boats that have either a round or diamond shaped flange with a threaded drain plug in black or white for about five dollars and less.
Surrounded by pricey sailboat items made by Harken, their nylon drain plug assemblies are the least expensive item in this totally well stocked store for original Laser, Hobie, Harken and other brand, sailing items.
Fays' is the place to go ...... check out their bargain box of reduced price, left over, colorful lengths in different diameters from 1-cm to 11-cm ..... very high quality, shorter left-over lengths of yacht line, used for a row boat bowline, or something ..... short lengths for short money!