Old instruments should generally be preserved in their original state. When there is need to play on an instrument of this type, I suggest a copy of it.

When the historic instruments needs to be played on, I recommend following preparations

• soaking of the instrument in propolis or an oil bath
• closing of existing fissures
• replacement of the old tuning cork
• replacement of threadings
• tuning (by application of bee wax)

Copies can be rebored, because wood shrinks naturally. Prices depending on required effort and materials.