Should piston gudgeon pin retainers be replaced at rebuild?

Marcohotrod said
stock 340 pistons are machined for a single tru arc retainer, flat side facing out. some aftermarket pistons are machined for double tru arcs-inner retainer with flat facing in, outer retainer with flat facing out

Measure a spiral lock sometime.

We aren't talking about 340's and aftermarket pistols, right...