You have beaten me to it John D. I just discovered this trick for myself. I use a piece of expanded polystyrene and stroke the blade through it to clean off any burrs. It works perfectly. Here is an example: New Gillette blade, no polystyrene hone; first shave slightly rough, some burn and weepers, in other words a typical first shave with a new blade for me. The next four shaves are fine no complaints, the sixth shave and I judge the blade is done, I ditch it. Next blade: again, a new Gillette, this time I hone it with the polystyrene, first shave, perfect. No burn or weepers just an excellent shave. Same for the next...wait for it...eight shaves. believe it or not I have had nine perfect shaves and expect to get at least one more before I discard the blade. In future I shall always hone my new blades with polystyrene. Give it a try.

John.