Originally Posted by SmokerKing
I've used the hole saw and unibit methods. Hole saw is a PIA compared to the unibit IMO.
The Unibit works great. If you stop at the right step on the bit, you can thread the nipple right into the drum. ( I still tack weld it on the inside)
I only have used the hole saw. I've only had one issue with it. Once it wobbled a little bit as it was cutting. This resulted in a slightly larger hole than the nipple which kept me from being able to thread the nipple into the side of the drum like I had every other time I used it. All I had to do was use two conduit nuts - one on the outside and one on the inside - to lock it into place.
Pro Q Frontier, UDS (Little Red), "Turtle Drum" UDS, CG Gasser KCBS CBJ#61160