After serious thinking Cash wrote :
I've never tried that but I would suspect that it would tear rather than cut
due to the shape of the end. I might grind an old masonry bit over the next
few days and give it a go to see what happens.

To grind it you will need a green grit wheel, but I suppose you already
knew that.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk