You won't have to worry at all buying from Clarinets by Copeland because all the guess work has been removed. We only buy top quality instruments and they are fully serviced before they are sold. They are also set up by a clarinet player (masters degree in clarinet performance) and clarinet repair specialist from Onks Woodwind Specialist. Www.clarinetsbycopeland.wordpress.com or www.facebook.com/clarinetsbycopeland. I stock R13s regularly.