These F-81 nuts and washers fit the bill, no problem with the two packs ordered. We mount extended machined plastic F-81 female/female adapters to the plate and these nuts are installed with sufficient torque. So far so good, no failures. The delivery is fast, the parts were there within a few days. When a product is as simple as a nut and washer I can't comment on how well it works because the expectation is that it just works. Two more kits should be arriving shortly to continue assembly.
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