As promised here are the photos of the magnet cores from my Metallica . You can see that the same dimpling is evident on top of the steel cores . If anyone thinks that the dimpling is caused by soft / inferior clearcoat thickness or quality , or the quality of the playfield timber then how would you explain the same dimpling on top of these steel posts .

No amount or quality of clearcoat is ever going to be harder than a STEEL post ..