Here is the modification which I have made to pull down the cut-off bar of a Zuckerman Flemish harpsichord which I have for sale. It had been kept in damp conditions in Devon, causing the timber to expand, the pitch to rise, the tension to increase and the soundboard to rise up and touch the strings.
Let this be a lesson to all harpsichord owners - one summer in a damp place can seriously damage your instrument!
The aim or the repair is to minimise the damping effect of pulling down the soundboard by making the fixings flexible. The adjustable screws hold a padded block, and the spring has some stretch in it.
Obviously, this repair is not as good as fitting a new soundboard, but this is reflected in the asking price and the sound is still good.