They have alternated through the years. Many have come with hammers native to Petrof and many have come with Renners through the years. Today you can get two versions of the action with the same basic design parameters. A Renner supplied action and one built with Petrofs own parts. I dont know at present whether they are using Renner hammers on all grands nor not. Regardless, they are quite hard and respond well to deep shoulder needling to open up the sound. Cheers RicB Hi Dale, So far, so good! Can you remember offhand, whose hammers they are using? ric
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