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I'm thinking of making/adapting a music shelf stand extender (example: The Manhasset M91 "Stand-Out") so it would be easily portable from one stand to another (e.g. from home stand to rehearsal and gig stands). The underlying assumption here is that the stands involved would all be standard Manhasset ones (or something "similar").
The primary stumbling block to the portability appears to lie in how the extender would be attached to "foreign" (I.e., non-home) stands since the scenario of carrying an electric drill and fastener hardware to sites and drilling through other people's stands doesn't seem realistic. I MAY be able to get away with just using some strong spring clips in place of the screws. An alternative might be small/strong magnets.
If I go in the magnet direction, then an alternative solution would be to just cut a piece of acrylic sheet (maybe 1/4" thick), into a couple of pieces (one for the back and one for the bottom shelf extender -- or just use a piece of angled aluminum stock for the bottom shelf), glue those together, then glue magnets to the back, and voila!.
Has anyone tried something like this? Any thoughts/experiences to relate? The more I think about it, the more I'm leaning towards the magnets and acrylic sheet idea as inexpensive, easy to do, and easy to make just the right size.