Sorry, I cannot supply instructions for the Flemish Virginal.
The Flemish virginal (or muselaar) has a distinctive rich sound because of the part of the string which is plucked. The Bolton instrument is 1.65m long and 0.49m wide and is light enough to be picked up by one man.
Although the cheapest in the Bolton harpsichord range, the Flemish virginal is often thought to have the most attractive tone, and it is certainly distinctive. The credit for this goes of course to the Ruckers family who developed this marvellously simple design in Antwerp in the 16th and 17th centuries.