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Johnwa, that there is a power hacksaw. They work great, but a bit slower. Blades should be a snap now you know what it is. Edit... Looks like it's been identified already... Sent from my H3123 using Tapatalk

Busy bee has a 6" independant 4 jaw deal for $39.99. It's a wood lathe chuck but it's pretty solid. Threaded 1"-8tpi. Should work great for your needs. Sent from my H3123 using Tapatalk

Make that an army of two. I'm in for a MeetUp.

Brown cutoff wheels I'm familiar with in that size are for masonry. The steel ones are grey. Check you have the right disk. A steel cutting disk on a small angle grinder zipps through hss bits pretty quick.

Not sure welding is the best method for a breach plug. I would look into a threaded plug. It needs to be much thicker too.

I went with the perlite and sodium silicate because it was a very inexpensive option. Sodium silicate can be made from silica crystals (cat litter) and sodium hydroxide (drain cleaner). Perlite is cheap from the garden store. PPE required for sodium hydroxide! As stated, it holds up very well...

Line it with a mix of perlite and sodium silicate. It's very light and very insulating with a very good high temperature resistance. There are YouTube videos on the process.