I,v just got hold of oneat the local second hand shop for $NZ 2, and a bag of a dozen tips for $NZ1 including a tip that fits the parting tool blade, I think it may be a little bigger than the average modlers size, the tip cuts a 4 mm groove. I,v taken to giving it a whack with the back end of the wire scratch brush. The tip had been used and, it was a bit blunt, but a touch up with a diamond lap, it sailed through a bit of 1″ scrap, but because of the width it did pull the revs down a bit (1 1/2 hp). Ian S C