hmm... depends on your calipers. the last few I've done have been six-pistong tokico. and I normally gently push the pistons out with the caliper whole, so the pistons meet in the middle. Then split the caliper and pull the pistons out.
Not sure I understand how you'd get the piston out without splitting the caliper? I'm assuming an active piston either side of the caliper. I think an old GT550 caliper I once serviced only had a single active piston, and was a single cast item.
what's the Sealey tool, do you have a link?
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