The Blashaus Bass Clarinet crook I have been using for the last year can only be described as having a „turbo-supercharger“ fitted to my instrument. Since the first time I tried the crook at Martin’s shop in Luzern I have been truly overwhelmed by the improvements and benefits it has created for me.

Mark O’Brien – Principal Bass Clarinet, City of Birmingham Symphony Orchestra.

https://cbso.co.uk/profile/mark-obrien
http://www.bcu.ac.uk/conservatoire/about-us/birmingham-conservatoire-tutors-and-staff/mark-obrien