Seattle Fabrics sells the 4-way molded lash tabs (sew-on type) for 70 cents each. Most decent local paddling outfitters will stock some too. Take them to a shoe repair shop with some PVC raft patch material cut to the size you want and have them sew the lash tabs on with their heavy duty machines. Or, if you have a friend with an old Singer treadle sewing machine, they can do it for you.
In fact, anybody who does outdoor activities and would like to make or modify or repair their own gear would do well to buy a functioning old Singer treadle machine. They can be had for a song on Craigslist just about anywhere in the country. The 1920's and up models with the standard modern bobbin work best, you can still buy leather drive belts for them and the suckers will stitch through a two by four, I swear. I have sewn multiple levels of canvas, installed zippers in leather jackets and sewed neoprene hatch covers and wet wear with my two Singers. Few modern electric sewing machines (at least the non-industrial ones) can do that as well as a treadle.
First Need Purifier
Overstock Outlet Foods
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