Hi Stephen,
Of course the manual states to use their staples for best results.
However it does at least state it is designed for a wide variety.
Most hardware stores have a range of staples to choose from.
Home Depot, Harbor Freight, Lowes etc. Try a chisel point this may help penetrate the wood deep enough. All staples are not made the same. So again trial and error may be the quickest route. Fortunately you can purchase small boxes for your testing.
The manual for this stapler is here:
(Page 2 talks about the staples to use.)
Black Decker 9701 Instruction Manual Page 2
Good luck and hope this helps!
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