re: Drilling angled holes in a cylinder

Combating movement is key. If it rolls it's hard to catch up, so use a 2 x 4 or similar, and cut a V notch in it big enough to set the cylinder down into. Clamp it into the carrier so it is still. After that some trial and error with a dowel, approximate size, is your friend.

Lotta you tube on the subject if my word usage threw you off

Good luck.