This got me to thinking about DIY furnace brazing on a small scale for small parts. Now that we have inexpensive non contact thermometers we have the ability to measure and put better numbers on actual temperatures than just the look of the metal. Which works fine for the experienced hand when dealing with steel, but leaves us with not much when heating other metals (like zinc plating) or ceramics like furnace brick and many types of insulation. But that's another subject.
For this one, the machinist's jack, I suppose if it was a problem having the washer loose one could roughen both surfaces and glue them together with a well prepared joint.

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