Thanks for the comment RezDog in my mix of information I am afraid of put too much pressure on the spine and cause more wear than it already has due to the fact that the razor belongs to a barber who used on daly basis as a work tool, although I used my both hands to control the strokes and add some pressure in the first stages with the heavy slurry since is a coticule I am guessing some pressure must be applied in order to obtain results since is a fine grit sort of speak, I was thinking in use some tape but doing that I will be adding more variables to watch after