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So I got it out without damaging it.... different story when the drill broke and *skewered a finger on my left hand 😂... talk about getting my hands dirty!!
anyway.... This was my process:
1. Center punch each of the peened fingers.
2. 3.0 mm pilot drill.
3. 5.0 mm drill - when the chips get bigger you are cutting the washer retained by the peening.
4. I used a small flat screwdriver (shaft through handle) and hammered into the non-peened interface between the washer and the piston.
5. Inverted and hammered from the brake pad side in an anvil to break the washer free ... out it all came.
6. The new pistons did not include circlips so I'll need to see what's available.
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