If you take the plastic sub base off, it's the perfect drilling template for your insert plate.
Is it a 3 hole or 4 hole pattern? My Porter cables are 3 hole, so it's the screw hole circle diameter, holes spaced every 120 degrees. I laid it out with a protractor and scale the first time, the second time I used the base plate and a transfer punch. If you are going to be using template guides you really have to make sure you are centered on the plate when you drill.Thanks Doug, I was going to take it to work use my mill but ya that's probably good enough. Thanks again.