I was watching this clip of workers laying tile using a jig…
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I also learned that a company called Milescraft sells a split version called KneeBlades; they’re basically kneepads with wheels.
The wheeled dolly parts can be detached from the kneepads.
I’m not sure if the KneeBlades are any better than the one-piece knee creepers–I’d be worried about inadvertently doing a painful split–but they are pricier, at $60.