I used a hacksaw, a dremel with the heavy-duty cut-off wheel and some small files
To figure out where to cut, I drew lines to cut along, on the outside of the extinguisher body. This includes a nice ink pen, an architects scale (tri-angle type ruler), and a piece of paper. The ink pen could have been a scribe, instead. A sharpened nail, or ice-pick would work for that
I went and recycled a few photos between steps, as I didn't take enough pictures during the construction
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Signing UpStep 1: It all started with Pachanka's Wokfi
And this, is a 24 inch wok I found at Goodwill for $7, mounted on top of a telescope tripod. Handles were removed and the thumb-fi taped and hung off of some string into the focal point
But before I could test this wokfi, I read yet another instructable for a yagi cantenna, and after following some of the links in the comments I decided to build this cantenna










































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If all you want to do is just grab more signal, the best approach is to increase the physical size of your antennas 'ear'. In other words, take a look at parabolic dish antennas. The bigger the dish, the more signal you can grab out of the air. And any size dish can be made to work with the same adapter.
A less effective, yet improved alternative is to add a cone to the end of the can.
PS: Something you might want to take a look at is what I'm using these days. A Ubiquiti Bullet.
Your proposed experiment I'm assuming, is to attempt unscrewing a fully pressurized scuba tank? Huh, I remember wanting to do that when I was in high school. I don't know if it was the A-Team or McGuyver, both of those shows were playing at the time. But they were the inspiration for that scuba tank fascination.
Did you know that a steel scuba tank if cut in half, has a wall thickness of over 3/8ths inch? It took me a while with my sawzall, but I've done that once.
sarcasmmm........
The WiFi Max adapter appears to be an access point for your 360 to connect to. It looks like it should work exactly the same way as what I did, just accomplishing a different purpose.
Did you know that you can use a router with built-in wireless on your 360 to connect to another router? Look at DD-WRT, that's an alternative software that can run on a router. It allows turning the router into an adapter, which means you can plug an adapter into the ethernet port instead of the usb.