Surface cleaner spray arm

I’ve got a belt driven 4gpm machine and am using a 20” GP Hammerhead surface cleaner. It does pretty good, but I’ve been considering getting a 16-18” sc to hopefully be able to move around a little quicker. Would changing out the spray arm to a smaller size allow my machine to operate more efficiently just like using a smaller sc?

It would be really hard to judge where you are cleaning and not have overlaps

I think could gauge that decently enough after a little practice, but other than that, would the 20” sc at the same way a 16” sc works with the same spray arm?

Don’t know. Surface cleaners and parts are cheap. Buy some stuff and tinker

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or buy & test a 16" and sell off the unneeded one…