There is no skill required for putting charms in equipment. The Larians used the closed charm slot graphic from DD for the charm slot graphic in BD, but the slots are not actually closed.
Really ??? <img src="/ubbthreads/images/graemlins/eek.gif" alt="" /> And I thought I hadn't aquired the proper skill yet ... <img src="/ubbthreads/images/graemlins/cry.gif" alt="" />