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I was skeptical about the "set the arm once" pitch, but it genuinely works—I just tweak the loop and I'm done fussing with the whole setup. The fact that buying two saves five bucks is a nice bonus since I ended up needing one for my main kit anyway.

The two-pack deal actually saves me a trip to reorder, and the loop extender clicks into place without any fiddling. Now I can fine-tune the grooming loop itself instead of constantly re-adjusting the arm, which is exactly the convenience I was hoping for.