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Still haven't gotten this pen apart, but it's very shiny after a few trips through the ultrasonic cleaner! Further research suggests that these pens were not field-refillable, but had to be returned to the manufacturer for service. Richard Binder mentions in his collection notes that he's converter some Reynolds pens to use Parker-type refills, but not indication as to what steps he took to accomplish this, and so far I've had no reply to my e-mailed query. If I get impatient enough, it's getting chucked into the lathe to bore out the main tip so that I can try driving the red end out from that direction.