I was on the killing floor in a large meat processing plant years ago(not for the faint of heart!). The cutters(I think that's what they were called). would pass the edge over the blade twice, once on each side of the blade, make a few cuts, and repeat the process. Why then is is necessary to repeat this process so many more times when alighning the fin on a str8 razor? In theory(only mine, of course) it would seem that if the edge and spine are flat and a few passes are made lightly, why are more needed?

Steve Boyd