A load guide for securing a load relative to a boom includes a base secured to the boom and a retractable arm assembly attached to the base. The antennae unit may be used to disable the operation of the communication module when the antennae unit is inserted into the communication module. The cable spool has two flange members coupled by a center post, together forming an exposed cable storage chamber. The profile access unit accesses the profiler on the basis of the information in relation to the storage location obtained through the conversion, via a corresponding profile access interface. In an embodiment, two additional independently biased electrodes are used to control the electric field and space-charge close to the gate edges. The seal has a plurality of weakened areas which allow portions of the seal to be removed for increasing the size of the seal opening to accommodate wounds or lesions of different size.