I made a pair last week and have done about 80km so far with no issues. They're pretty brilliant, even if I do say so myself.
Front tyre, about 150 1/2" No6 sheet metal screws, back tyre about 80 of the same. Screwed them from outside in through a tread block first, then removed them, and reinserted then sharp end out through the perforation.
I don't see the point in cutting the protruding point down. They'll wear with use, and replacing them once worn is tedious work. I put up with the rolling resistance.
Lined with an old pair of Continental Avenue slicks with the bead cut off.