when you purchase an accudraw, it will come with a template for the holes you need cut the cnter hole can be cut wit a 2 inch hole saw and arbor,, and the other holes can be drilled with a 9/32 and 5/8 drill bits now on the placement that I`m not sure of on an Excalibur but am sure you could make a best guess on that and you have to drill 6 holes total have youns purchased the Accudraw yet if not contact me via Pm I have one.. because I changed out my accudraw for and accudraw 50..