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@Dammit
I have been fitting the bleed screw to the lever before the calliper, and making sure that the bleed port is full to the brim with oil before fitting the screw. Calliper body is horizontal when I fit the screw (or the oil leaks out).
The two pistons that extend have wet sides, the two pistons that don’t want to extend don’t. I lubricated all the pistons last time I bled this brake. Coincidence? Something to investigate?