Is it ok to copy a W5 head and make it better or are we just mad at Speedmaster

I think W2's would be a hot ticket. What makes a W2 a W2 though? What do they say, you have to change 5 things to reapply for a patent?

You have to change a product 10% to not be infringing on a patent. However the knock offs don't even care about that.

Tom