This wowed me. Brigitte (of the Overton Goldies in Germany,) saw me fussing in one of these threads about my Overton low D clogging, and emailed me offering help, which I took her up on. For me her most useful suggestion (doesn’t say much for me that I never thought of this 
) was to warm up or clear by blowing with a finger over the vent!
Guess it doesn’t pay to have folks complaining on C&F, but I found this to be a terribly nice gesture!