Have you spoken with Marten or anyone else who does commercial sewn eyes about the cost of manufacturing? Will the one end be the cost of two sewn eyes and the ring? Not your cost to customers, just your cost to have them made. Feel free not to throw a number out, as that's your business and profit margins.
I'm curious if you could skip the sewing between the ring and carabiner and instead use one of the restrictor rubber bands? This would cut down on your time hand sewing and potentially cut down on your manufacturing cost once commercially built.
Individual bands are under $.50 each.
This banding tool, called an Elastrator, can be used to apply strong rubber bands to your girth eye splices to reduce and control the eye size. The bands can also be used with carabiners, loo
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