Redrilling Brake drums for 4.5" bolt pattern

I just redrilled my drums a couple days ago.


I made myself a transfer punch. Center punched for all the new holes, and started drilling, first with a small 1/8" bit, then moved up to the 1/2" bit. ( 1/2" lug bolts, I figured 1/2" holes, wrong)

First mistake was not looking closely enough at my new moser axles. The studs they installed have a shoulder on them that protrudes from the face of the axle flange about 1/8". This part of the stud is actually 5/8". So I had to redrill the first drum with a 5/8" bit.
Then second drum I started with the small bit and then went to the 5/8".
Worked fine. There was a couple holes where the drill bit may have walked a little, but just touched up those holes with a rat-tail file and I was good to go. The drums fit perfectly onto the new axles. Center register and the lug bolt holes all match up fine !