This has been a very good month for my digital Casio dream scenarios.
Since childhood I've wanted to wear the F91W. I recently discovered and ordered the W217H. It's perfect. It fit me comfortably on the 2nd to the last hole. About 3/4 of an inch protrudes from the keeper.
I've also always really wanted a 5600. I've owned plenty of larger G-Shocks. They're not for me. I found and tried on a 5600 at Target and it fit me comfortably on the 2nd to the last hole. The 5600 strap has very little material after the last hole, thus the keeper is useless at that point.
When I got home I busted out the ol' bin - o - parts. I found a keeper that's about 4-5 mm long and 18mm wide. The 5600 band measured at 18.8mm on the narrow end. I took the 5600 keeper off and swapped it with the smaller keeper from my parts bin.
The result: The 5600 fits my large wrist. The keeper is tight enough to stay in place and not slide around during activity. About 2 mm protrudes out of the new keeper, but, it hasn't been a problem thus far.
And the W217H: