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I remember the benchrest guys would have their barrel makers build them wilson style dies using the same reamer they used on their barrels.

An average temperature can be read by wiring two or more thermocouples in parallel into the same input of your PID controller. You won't know individual temperatures this way, just the average.
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It could be a loose connection on the thermocouple, or a failing thermocouple.

Cornish game hen, rack of lamb, home made bread, corn on the cob, roasted potatoes, waldorf salad. Enough leftovers for at least a week.