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Make a notch in the piston with a dremel or similar tool so that you can get a pick in the groove and pop it out. Interestingly enough the service manual shows this notch, LOL. I guess they forgot about it in the casting.
How do you remove the wrist pin retainer clips from the piston?
Detonate it
or
Rotate the retainer until the gaps are positioned in the cutout area. Then use a pic or pocket screwdriver to push the ring end towards the piston pin and scroll around the retainer, an L shaped pick works best.