Reddit mentions of Central Manual Knockout Punch Kit

If I may recommend a better tool than the "cheap bits"....I built a HERMS kit a couple years ago with a single step carbide bit and one of these Manual Knockout Punch Kit https://www.amazon.com/dp/B0012F8GCQ/ref=cm_sw_r_cp_apa_hsnOybVW95Y7Q

If you want a clean cut that is very easy I highly recommend a knockout punch.

https://www.amazon.com/Central-91201-Manual-Knockout-Punch/dp/B0012F8GCQ

You drill a small hole to get the tool through and then punch out the hole in your kettle. Takes less time, looks better, and makes a cleaner cut. Fair warning some are sized in inches and others by the size of pipe that can fit through (like the link below) it so read before you buy.

https://www.harborfreight.com/knockout-punch-kit-10-pc-60575.html

The only way to successfully crimp a micro MOLEX connector is with this tool

Almost impossible to screw/drill in tight spaces without this

Need to punch a hole in an electrical box without spreading hazardous metal chips everywhere? Use this

Need to tighten the connections under a faucet? Good luck doing it without a basin wrench.

Need to fix a Moen shower valve by replacing the cartridge? Your fucked without the Cartridge Removal Tool that is absolutely useless for anything else.

i'm not sure why people stopped using these...

conduit punch

right tool for the right job...

I'll try to get some more pics up later when I get home from work. I had a friend machine it but aluminum is easy enough to drill that you could do it with a drill press. I wouldn't try a cordless drill with that diameter though. Another option is using a [knockout tool] (http://www.amazon.com/Central-91201-Manual-Knockout-Punch/dp/B0012F8GCQ), and then you could use just about any metal box you can get your hands on.

The chassis is important for shielding. I highly recommend BUD for these. They are inexpensive and you can work the soft aluminum chassis with hand tools and a punch kit like this. Depending on how much time you want to spend, you can make very attractive-looking devices with these.

Grounding is important in building a preamp or any kind of electronics handling low-level signals. The usual way is to have one chassis ground point as close as possible to the input connectors.