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.
have had this stapler for many years now, and love it. have not had any problems, & it has never failed me. also had another one that just broke down after probably 25 years. tried to fix it but couldn't. would buy another swingline in a heartbeat. they're the best.
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