Hi all, I have a set of replacement L24 pistons/con-rod assemblies but noticed that one of them has got several indentation/impact marks restricted to a small area between piston top and between the ring grooves - see photo. No idea how this happened - probably was there when I bought them some time ago. I'm no engine expert, so looking for advice as to whether it is still useable on the basis that the rings do the sealing - or is it scrap? Many thanks in advance.