Just to let you know, I managed to free the piston in the end.... I tried an airline but didnt budge, also tried a heat gun but the piston must have been getting just as hot as the cylinder so that didnt work either.
Freezer! I put it in the freezer for an hour then it just tapped out. Iv cleaned it up and now its working just fine.
cheers for your advice though,
Rob
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