This beige strap made by Deering is adjustable, brand new with instructions on how to attach it to an open-back banjo. You can see what it looks like at https://tinyurl.com/yxw8cvpo which includes a video. Note that it won't work with a heavy bluegrass banjo that has a resonator. Easy porch pick-up in Sausalito.
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Nylon strap for open-back banjo (Sausalito)
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