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For me, I find the TNT to be 100%. If it slides its not set. If it digs in and feels consistently sticky and gritty I feel thats an indicator. I always do a visual to follow the striations which is...

Its a very good test. I don't know about almost shave ready as I wouldn't do that after the 1k. Even after doing it after the 1k I do 10 laps to restore it to pre TNT.