I'm predominantly a BBb bass player but i've been attempting to learn trombone for a couple of months. Getting better by the day and I'm now hankering for a bone with a Bb/ F trigger. Not too bothered about bore or wether its open or enclosed tubing (but maybe I should). I'm an old fashioned (and old) bloke who would prefer to see and try instruuments prior to purchasing...so limiting travelling to 50 miles radius of York. If you've got a Bb/F bone thats collecting dust.....and it plays ok....give me a pm.