What temp are you annealing? I make a lot of 1", or larger, hollows with 96 and frit. I anneal 1 hr at 960 and then a very conservative ramp down. I have very few problems with frit on 96 unless I let a bead get too cool before it goes into the kiln.
Have you recently changed your reamer? Whenever I put a new diamond reamer in the Dremel I crack a couple beads from the inside. It's the price I pay for letting my mind go on autopilot while cleaning beads.
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Kathy
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