david,
it´s no problem for me to ask the krahmers about "your" violone.
i was i contact with them regarding some others basses not long ago.
you could post or pm me your questions and i call/mail them.
but maybe it will take some days because i will be out of town for a concert this weekend (sat-tuesday).
(or you could test their english if you mail them:
info@poellmann-contrabass.de 
)
anselm