These fittings have a very simple design flaw: they lack ground/machined flat surfaces for tightening the fittings. While this is acceptable for non-tails, its absence on tails is a fundamental design flaw. And these fittings are end fittings by definition. There's really no excuse for the lack of edges: they're designed to help you find the keys as you pull them on. Without them, you'll have to use channel locks or the like, which will damage the surface of the fitting and generally make it difficult to keep clean. Why were they left out? While this is speculative, it likely saves the manufacturer money: by eliminating this manufacturing step, they can produce faster. However, at the expense of the consumer: This makes them significantly more difficult to assemble and disassemble. Bottom line: buy someone else's accessory. With cast or machined planes. The ones you can install and replace with regular wrenches, not adjustable wrenches. Do they work after installation? Yes. But buy the ones that fit well and these don't.
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