[ATM] time to switch tile tool

[horace r davis]

On my 16" mirror I have reached .195 depth target .200 have been working
with # 80 grit past 3 hr. Have fixed the flat edge, at what time do I
switch to tile tool with #120 grit. My tiles are 2 inch hex tiles spacing
in mat is only 3/16 inch between titles. Will this work or do I need to
brake them apart. Horace 30 hr grinding I have discovered that I was not
using enough pressure on my tool. started applying about 25 lb with the
#80 grit and it worked grate.