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1. I tend to use the center or slightly to the rear because I like to have a closed rear on the forge. I put the steel as far into the forge as I can.
2. A hole saw in a hand drill.
3. Satanite works well. It's super thin, like house paint and can literally be applied with a brush. If you have a heavier refractory just add a lot of water to it.
4. Depends on how big your case is. You want the interior to be as small as practical. Generally 3 or 4 inch interior diameter is enough. With a good burner it could be larger. 1" of wool is enough for insulation, more can be used to make it smaller but then takes longer to heat the forge.
5. I like it closed. You have a fire extinguisher so the end is closed. If it doesn't work out then you can just cut it off ....
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