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Not a peghead fan here; too cheap looking and plastic. And yes, I have owned Pegheads.
I adore gotoh deluxe friction tuners, E. They are even on my high end Kiwaya (they look dirty in these photos, but those are reflections...they actually sparkle.)
I mention this (as yours is not a thread/question asking for people's opinion on it, but about your swap--you already know your ukes) just in case it's hard to put on or the holes are not right for your Grover gears...then, you might consider Japanese-made Gotoh Deluxe frictions so you don't have to fiddle with the holes (maybe). Smooth, tight, no tuning issues, and look like a million bucks. Although heavier than Pegheads, its not noticeable on a concert or tenor, and they are bulletproof.
Here they are at Elderly--chrome, gold, etc. (scroll down)
http://elderly.com/search/elderly?terms=GOTOH+DELUXE+UKULELE+TUNERS&x=14&y=13
http://www.g-gotoh.com/international/
Again, NOT to change your mind--just an option if Grovers wont work, Eric.