[johnnyrod]

You need to know the sizes of the shims that are already in. When you have the table, you look up the current shim against the measured gap and read off the new shim required. Aim for the upper half of the gap range i.e. looser rather than tighter, but if it's in spec then don't both changing it. So, it's a bit of a faff as you need to take the camshafts out to find out the shim sizes first, then if you're going to ride the bike you have a fair bit of reassembly that's going to be undone when you get the new shims. Once they're right though they pretty much never change.