Marcus, that F30FJ failure sounds similar to my F44 failure.
In the interest of science, the remaining F44 was carefully disassembled. Kids, don't try this at home.
After removing the ejection charge, a hacksaw was used to (very) slowly cut around the case, right where the delay insulator would be expected. Bingo.
Photo 1 shows the two halves
Photo 2 shows propellant grain removed
Photo 3 another angle, highlighting the interesting forward geometry of the grain
Photo 4 shows the delay grain, insulating sleeve, O-Ring, and aft bulkhead, which threads into the case, and is epoxied
- also note cuts in the delay sleeve from this procedure
Photo 5 shows most pieces removed, the delay is still in its sleeve
Photo 6 another angle, from which the grain core can be seen
Photo 7 the delay has been removed from its sleeve
Photo 8 shows the delay, sleeve, and O-Ring re-inserted, to illustrate a roughly 1/32" gap when pressed in tightly
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That's all folks. Aerotech is sending me a new pack of motors.