a source of electrical energy illustrated to be rechargeable batteries 196 in the detachably connected handle 32 a handle 32 with discharged batteries 196 can be detached and replaced by a handle with charged batteries and the handle with discharged batteries 196 can meanwhile be recharged the printed circuit board 189 is mounted for limited floating movement to the section 160 of the subframe 159 by a pair of resilient elastomeric bushings 197 the bushings 197 are forced through holes 189 39 in the printed circuit board 189 and are received on posts or studs 198 screws 199 pass through washers 200 and are threadably received in the studs 198 the printed circuit board 189 can pivot slightly about a line extending through the centers of the studs 198 this line is indicated at a point 201 in fig7 the washer 200 helps provide restraint to the pivotal floating movement of the printed circuit board 189 so that the pivoting is only slight in the directions of double headed arrow a the ribbon connector 192 enables the printed circuit board 189 to pivot as shown in fig5 8 and 9 the printed circuit board 189 has a male type connector 202 the connector 202 can be detachably connected or coupled to a female type connector 203 the connector 202 has a series of contacts 204 aligned with resilient contacts 205 when coupled the connector 202 has cam faces 206 at.