with a female receptacle and the housing 312 a male connector the housing 312 includes electronics for interfacing the communication of power and or data from one segment of the cable 16 to the segment of the cable 16 carried on the spool 300 the upper end of the outer drum 302 includes a notch through which the cable 16 passes and couples to the housing 312 of the inner drum 304 fig2 a also shows radially extendable retractable dogs 314 e g extendable retractable by motor spring hydraulically and or otherwise adapted to engage the interior of tubing e g well string 12 and support the spool 300 relative to the tubing the dogs 314 are arranged around the circumference of the housing 312 three equally spaced dogs 314 are shown however fewer or more can be provided the dogs 314 of fig2 a are configured to engage the interior of tubing to prevent the spool 300 from moving downhole relative to the tubing the dogs 314 can be of a type that engage and grips a profile in the well string and or can be of a type that engage and grips the well string apart from a profile e g slips and or the like fig2 a also shows a lifting tool 316 for carrying the spool 300 up through the.