Okay, I use the Nike and have never tried the larger scales for short putts. Here is my method for all scales, "L" actually meaning a spot just to the right of the "L" in "ORIGINAL":
......................................Full....................."L"......................half
10-foot scale...............13.......................10........................6
20-foot scale...............27.......................22........................13
50-foot scale...............67.......................55........................34
100-foot scale.............140....................110......................65
The values creep up because I want a putt that goes 2-3 feet past on all misses, not one that goes 10% past. These seem to work well for me. What do you guys think? How do you figure distance using the 20 or 50 scale for a 5-6 foot putt?