I bought this along with a Neotch trombone handle (which I really like). According to Neotech's video, the crank fits into this case and slides easily into the trombone's bell. In my experience, the bag is simply not suitable for grasping and has an excess volume that is not really needed for this particular application. The fit in the bell was ok, but not outstanding. I found a better spot for the handle and decided to use it as extra storage in the trombone case, but found it too bulky for other purposes and offered little storage space. It's a decent product but I haven't found a practical use for it yet as the dimensions always seem a bit off.
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