There are two styles of tuning hammers that can be supplied with these harpsichords. One, seen below is supplied free with the harpsichords along with an A415.3 tuning fork.
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Clearly this tuning hammer is just a functioning tuning hammer which makes no concessions in its design to historical precedent.
However, more elaborate tuning hammers can be supplied for those customers wishing a more historically-based tuning hammer. These are designed using an antique tuning hammer in private ownership and have been specially made to accompany these instruments.
Click here or on the image for further details about the historically-based tuning hammer