Impact Hammer

[A440 Piano Service]

I'm intrigued with an impact hammer design and am considering purchasing one to try it.  

Two questions:

1.  Is there a model you'd recommend?  (I'd consider a used one from somebody on the list if you've got one to sell -- contact me off-list) 

2.  Everything I read says they're wonderful on vertical pianos. I'm wondering... is there some reason they're not advisable for use on grands?

John Dorr
Helena, MT
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