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The "real" way is to get a coupla Greenlee (or whatever) punches. Nice clean perfect holes every time. Expensive.
The cheap way is to drill the biggest hole you can (use a drill press if possible) and file. Or cut a circle of small-diameter holes, and file it out. Unless you are exceedingly neurotic, your holes will not be anywhere close to perfect. Course, you could get lucky, but it will drive you nuts. You will probably end up with metal filings in your skin. Fun fun oh baby.
I suppose there are other ways to do it. If you're planning on building more than one or two amps, and aren't going to use prefab chassis, just buy the punches. It makes life a lot easier. I use a 25mm for octals, and 22mm for novals, from Ruko (German tool company). I used to hate chassis work, but I foolishly insist on doing it myself. Since I got the punches, I don't hate chassis work as much as I hate tolexing.
Actually, do your first chassis without the punches, so that when you do finally get them, you will treasure them and treat them the way they should be.
steven
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