An apparatus, comprising: a tension member , a link comprising a distal portion , a transfer member , a tool member , and a non-drive wire ; the transfer member being coupled to the distal portion of the link and coupled to the tension member such that the transfer member rotates relative to the link when the tension member is moved, the transfer member comprising a rotatable pulley ; the tool member comprising a base portion movably coupled to the transfer member , the tool member comprising a contact portion configured to engage a target tissue, movement of the tension member urging the tool member to move relative to the link between a first orientation and a second orientation; and the non-drive wire comprising a first end portion , a second end portion , and a central portion between the first end portion and the second end portion, the first end portion being coupled to an energy source, the second end portion being coupled to the contact portion of the tool member , the central portion comprising a transition portion disposed within a cavity defined within a portion of the rotatable pulley , the rotatable pulley including a deep guide portion defined by an outer wall , the outer wall having a first wall portion with a first height, H1 , and a second wall portion with a second height, H2, the first height, H1, being shorter than the second height, H2, the first wall portion defining a wire entry sector at which the non-drive wire enters the cavity , and the transition portion having a compact first configuration when the tool member is in the first orientation and an expanded second configuration when the tool member is in the second orientation. a tension member , a link comprising a distal portion , a transfer member , a tool member , and a non-drive wire ; the transfer member being coupled to the distal portion of the link and coupled to the tension member such that the transfer member rotates relative to the link when the tension member is moved, the transfer member comprising a rotatable pulley ; the tool member comprising a base portion movably coupled to the transfer member , the tool member comprising a contact portion configured to engage a target tissue, movement of the tension member urging the tool member to move relative to the link between a first orientation and a second orientation; and the non-drive wire comprising a first end portion , a second end portion , and a central portion between the first end portion and the second end portion, the first end portion being coupled to an energy source, the second end portion being coupled to the contact portion of the tool member , the central portion comprising a transition portion disposed within a cavity defined within a portion of the rotatable pulley , the rotatable pulley including a deep guide portion defined by an outer wall , the outer wall having a first wall portion with a first height, H1 , and a second wall portion with a second height, H2, the first height, H1, being shorter than the second height, H2, the first wall portion defining a wire entry sector at which the non-drive wire enters the cavity , and the transition portion having a compact first configuration when the tool member is in the first orientation and an expanded second configuration when the tool member is in the second orientation. <EOS>