Use the specified high-capacity staples #35550 and know that it loads differently from most! Unlike many desktop staplers, this one does NOT have a piece of metal inside, on which the staples are straddled as they slide along. This model doesn't require that piece. The staples just balance inside the bay where they are stored and don't have to "ride" along anything. It helps to label the stapler with a reminder to use the specific staples. It is marked on the stapler, but isn't obvious.
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