First I made a 2" blocker from a V8 can. It did not hold up very well and I would not recommend using. The aluminum is too flimsy.
Step 3: Drill holes
Layout for a 3/4" hole. Use carpet tape to secure the disk to the drill press top. Line up your marks and drill. You need to get perfectly centered. There is no center punch to guide, so this is why you need to carefully lay out your 3/4" hole on cross hairs and boundaries on top. Drill 2 disks all the way through. Drill the disk top handle about 1/4" deep only.