yes, it is ok to take staples out and replace butt cap with new staples. However, unless the buttcap really needs replacing, you need to be carfeful. You don't want to start filling the bottom of the hairpin with needless holes.
I use a Hansen T-2 tacker.
(Before you ask, they are no longer available, unless you find one on the bay or used elsewhere.)
Head Stringer @ the LTC, Babolat Star 4 Stringer