Hi Roman,
I don't know where you are located in The Netherlands. There are some good luthiers here. In Rotterdam there is Ad Vermeer: http://www.advermeer.nl. He is a great repairman. He studied building violins and knows a lot about mandolins, banjo's, dobro's and other string instruments.
In Gemert you have Harry Boetzkes: http://www.hboetzkes.com/. He is a mandolin specialist.
In Dedemsvaart there is the Fellowship of Acoustics: https://www.tfoa.eu/nl/. A huge guitar store with a great repairshop and a lot of knowledge.
I am a professional mandolin player and these are the people I go to for repairs.
Cheers, Janos
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