Just curious how you guys are making holes in sheet metal for dimple dies that do not have the punch built in? Currently, I am using Morse bi-metal hole saws with chunk of 1x4 with varying sized holes pre-drilled that I clamp to my sheet metal to act as a guide to prevent the hole saw from walking. I have dimple dies in 1/4" increments from 1/2" to 2 1/2". In my electrician days, we used Greenlee knockout hole punches, but those are conduit sized. I have struck out on finding knockout punches in actual standard sizes. A CNC plasma table is not an option for me at this point anyways. Anyone have a quicker/cleaner/easier way of making holes? Thanks!!