An apparatus (210, 310), comprising: (a) a body assembly (211, 311), wherein the body assembly comprises: (i) a control circuit (217, 317), (ii) a battery pack (215, 315) operable to power the control circuit, and (iii) a first electrical contact assembly (292, 392), wherein the first electrical contact assembly is in communication with the control circuit; (b) a modular shaft assembly (216, 316) configured to selectively couple with the body assembly, wherein the modular shaft assembly comprises a second electrical contact assembly (290, 390), wherein the second electrical contact assembly is configured to operatively engage the first electrical contact assembly when the modular shaft assembly selectively couples with the body assembly; and (c) a coupling detection assembly comprising: (i) a detection activation member (200, 300) associated with the body assembly, wherein the detection activation member is in communication with the control circuit, and (ii) a detection trigger member (202, 365) associated with the modular shaft assembly, wherein the detection trigger member is configured to activate the detection activation member such that the detection activation member communicates a first detection signal to the control circuit when the modular shaft assembly selectively couples with the body assembly; characterised in that the control circuit is configured to verify operative engagement between the first electrical contact assembly and the second electrical contact assembly in response to the control circuit receiving the first detection signal, wherein the control circuit is configured to energize the first electrical contact assembly in response to successfully verifying operative engagement between the first electrical contact assembly and the second electrical contact assembly. (a) a body assembly (211, 311), wherein the body assembly comprises: (i) a control circuit (217, 317), (ii) a battery pack (215, 315) operable to power the control circuit, and (iii) a first electrical contact assembly (292, 392), wherein the first electrical contact assembly is in communication with the control circuit; (i) a control circuit (217, 317), (ii) a battery pack (215, 315) operable to power the control circuit, and (iii) a first electrical contact assembly (292, 392), wherein the first electrical contact assembly is in communication with the control circuit; (b) a modular shaft assembly (216, 316) configured to selectively couple with the body assembly, wherein the modular shaft assembly comprises a second electrical contact assembly (290, 390), wherein the second electrical contact assembly is configured to operatively engage the first electrical contact assembly when the modular shaft assembly selectively couples with the body assembly; and (c) a coupling detection assembly comprising: (i) a detection activation member (200, 300) associated with the body assembly, wherein the detection activation member is in communication with the control circuit, and (ii) a detection trigger member (202, 365) associated with the modular shaft assembly, wherein the detection trigger member is configured to activate the detection activation member such that the detection activation member communicates a first detection signal to the control circuit when the modular shaft assembly selectively couples with the body assembly; characterised in that the control circuit is configured to verify operative engagement between the first electrical contact assembly and the second electrical contact assembly in response to the control circuit receiving the first detection signal, wherein the control circuit is configured to energize the first electrical contact assembly in response to successfully verifying operative engagement between the first electrical contact assembly and the second electrical contact assembly. (i) a detection activation member (200, 300) associated with the body assembly, wherein the detection activation member is in communication with the control circuit, and (ii) a detection trigger member (202, 365) associated with the modular shaft assembly, wherein the detection trigger member is configured to activate the detection activation member such that the detection activation member communicates a first detection signal to the control circuit when the modular shaft assembly selectively couples with the body assembly;