i have been flattening a lot of tools, including a pair of pruning shears that used the whole wheel, including the drier center portion. as jeff and tormek support suggest, i have been using more water in the tray and have been trying to only use the wet outside edge of the side of the wheel.
as both jeff and tormek support also suggest, i have used the stone grader to try and dress the side of the wheel. it does make a difference, but the process is slow and inaccurate. i found an old post (2008) from jeff:
"Which truing tool do you have? If you have the older model ADV-50D, you can drill a hole through the handle from top to bottom (perpendicular to the current hole) back toward the end away from the cutting tip. Slide that onto the Universal Support and then slide the stop on so that the end of the stop prevents the handle of the cutter from backing away from the stone. Carefully position the cutter and the stone so that the tip will engage the side of the stone. Start the machine and swing the cutter in an arc. Move slowly to keep a consistent finish. Dress the surface with the stone grader once it is flat."
can i modify my TT-50 truing tool in the same or similar manner?