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But the new Bonna cases have a zipper tab that is a custom design. It's attractive, but there is no "hole" in it large enough to attach a supplemental pull tab. The metal tabs are not very large and have a tapered shape (smaller end at the zipper). So I went to my local parts store and bought some heat-shrinkable tubing. This is used in electronics very often. Imagine you have made a solder connection between two wires. Wrapping electrical tape around the joint is not a great long-term solution. So instead you would have a piece of tubing over the connection that is slightly larger diameter than the wire. Then you hold a match under that tube and it shrinks up to 50% of its original diameter and neatly seals the connection. The tubing is pretty tough once shrunk.
For my situation now I cut some tubing about twice the length of the free portion of the metal tab. However, I began to worry about the nylon (or whatever) cover on the Bonna case being damaged by a lit match in close proximity. I grabbed little piece of leftover packing cardboard that had a convenient-size hole in it and put that over the zipper before I applied the match. The heat of the match shrank the tubing neatly around the metal pull, so you can see it shrank more near the zipper itself. That taper will hold it in place nicely.
Below are photos showing the results. It's not very artistic but it works quite well!
My grumping aside, Dave, that looks like a great solution.
Quick question. I know this is probably not the right place to ask... I have an Adams with the Bona case. I'm going to be flying to NYC with it and was wondering if you think the case is 'good enough' to protect my horn? Or if not, do you have any recommendations on another case I should use? Thanks very much.