Looking at photographs of the Warwell bolster conversions it seems that some of them, or perhaps when they were first converted, had floor planking bent up slightly over the "toes" of the supports for the central bolsters rather than removed from these areas. To model this you would remove that bit less of the floor planking, so I have created a version of the gauge for this size of central bolster support footprint. This set contains gauges for both versions. I have also enlarged the handle on the small sizing gauge(s) used for testing the holes cut in the planking.