Wheel for pressure washer jet?

Anyone know of a wheel that can keep the height of a pressure washer jet steady, and mroe importantly help maintain a steady motion? I'm cleaning a large deck and its just that if ever I pause or slow down on a spot, it gets cleaned too well and leaves a bright patch or line. Evidently I am really bad a maintaining a steady motion. I've seen brooms that have 3 jects in them on wheels, but I need to use just the one jet for cleaning power.
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