Hi Mike,
I've encountered this rattle with a few EPs, including one of my TMB's. All it is is the last retaining ring that's down the inside of the barrel has come a little loose & the final glass element is loose in its casing - that is what's rattling. To fix is just to wind back that final ring washer securely. I'd suggest you modify a paddle pop stick to engage the little slot in thering as your tool. Less risk of damage to the EP.
Mental.
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