My old Mold Master 10# pot died about 6 months ago and I have not been able to get it back together until just now. The mica had fallen apart after 35 years or so, and no parts were available. I had it straight wired but it looked unsafe to me. A shooting buddy discovered the other day that mica was in microwave ovens and told me about it. I went to the local Gas and Electric parts house today and sure enough they had a sheet that was .010 thick. They sold me enough to make a replacement part for $3.50. I was amazed that he cut it with scissors. Since it was so thin I used 4 layers for additional strength. Put it back together and plugged it up long enough to see if it was heating, and it was.
Just wanted to share this bit if information so someone else might be able to repair one of theirs.
If I have time tomorrow I will see if it melts lead as it should.
Have a blessed day.