Nature of tuning pins, why technicians prefer blue

[Marcel Carey]

I've been reading this thread with interest. One thing that has not been mentioned is the steel hardness of different tuning pins brands. I agree with Dave N. that Diamonds are the best specially for uniformity. And they are also the hardest on the Rockwell tests.
 
I find this is something that bothers me a lot when tuning new pianos with tight pins. The pins will twist before they turn in the block. I've measured over 40¢ dofference with just pin twisting before I could feel them turn in the block. Of course, the fact that some manufacturers use #0 tuning pins doesn't help.
 
So, for me actual performance is more important than looks. This is the point I wanted to add to this discussion.
 
Marcel Carey,
Sherbrooke, QC
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