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Something wrong in here. you don't have to do many laps. When you Many laps 16 k brakes down the edge then you will have horrible edge.Try make your blade shave ready before you hit the 16 k . then...

at first please don't use pressure
second do you have chro2?
if yes then go head after the 16k do 20-30 laps on chro2 you should be ok.
if you don't have chro2 i think CHRISL was selling it very...