D’oh! You can cheat and put a G clamp or similar on the pistons to stop them popping out. This has the added advantage of meaning that each pump of the pedal forces the air and fluid out of the nipple, rather than some of the movement being taken up by the pads moving against the drum. Sometimes easier to do it this way as you have a little more access space to the bleed nipple and no risk of getting fluid on the pads.
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