While my R-13 is quite old and I've owned it for probably 8 years in the same location, the last 2 or 3 summers I've had issues with the barrel and the upper joint during the summer months. There's hardly any cork there to begin with, and while you can force the barrel on, it's really difficult to remove. Is there a solution to this? To top it off, I have a student who recently purchased a new Leblanc Bliss (wood) and she has the same issue on most of her joints. Thanks in advance for your thoughts.