Okay, now that makes sense. So the melodica can be rocked. I see that you already explained about tucking the melodica under the chin. There must be some good reason why I wasn’t paying attention. So I need a 5/8″ OD elbow. Or, to simplify matters, I can use a Yamaha blow tube, which has an elbow, with a piece of 5/8″ OD, 1/2″ ID vinyl tubing as a collar (or insert affixed to the melodica). I have one of the old ones here that has two 13″ segments. So, here we go. It works. One of us is a genius. I guess it’s you, but I’m a quick study.