If you return a DLE engine to Tower for service, and it was sent to them with a true CM-6 plug installed, it is returned to you after the removal of the NGK product, substitued with a DLE plug. If you receive a spark plug in a box labelled NGK or Honda, you have a real NGK plug. All others are copies.

If that's the worst thing that ever happens people have little to be concerned about, but I loearned a long time ago never to trust advertising to provide me with the information needed to make a wqualified decision.

I've seen far too many planes advertised to be excellent flyers that have turned out to be dogs from the distributor you mentioned. I still have a couple at the house that are hard pressed to get off the ground, let alone fly, when set up with the equipment advertised as necessary for flight opertions. Even when usin upgraded components they don't do very well. It's all about selling product.