You can buy an Oplux tether with a sewn eye from Wild Edge. There are other options to buy Oplux with a sewn eye as well. Alternative is, you can get a sewn eye on Samson Ultra Tech from treestuff.com. I prefer the ultratech anyway. You will have to call to order it though.
Side note: Samson UltraTech is actually stringer than Oplux, for those that care.
8.5’ Sterling Oplux with 6” factory-sewn eye
www.wildedgeinc.com
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www.treestuff.com