Henry, save your money. These units, while sounding like a good
idea, have a couple problems.
first, there is no good way short of a power spray, to get coolant
and lubrication to the bottom of the blade. This will cause
overheating on the cut, loss of the stone, damage to the blade, ETC
Secondly, you are going to have problems holding the stone in place
while cutting. The quill will want to kick up and away from the
blade, again with the potential of damage to the stone and
equipment, and you.
You are much further ahead to get a good faceters trim saw and use
it. Voice of experience here.