into the hollow portion 228 of the drum 226 in one embodiment the platform 258 can support a battery not shown thereon so that the battery is disposed between the second endplate 224 and the upper ring 212 preferably the battery provides power to the motor 254 details of one suitable battery for use with the reciprocating mechanism 200 can be found in u s pat no 7 320 843 to harrington entitled battery assembly with shielded terminals the entire contents of which are hereby incorporated by reference and should be considered a part of this specification as shown in fig3 and 4 the platform 258 preferably supports the shaft support 234 thereon in the illustrated embodiment a pin 234 a of the shaft support 234 pivotably extends through an opening 258 a of the platform 258 permitting the shaft support 234 to rotate with respect to the platform 258 about a vertical axis extending through the opening 258 a this pivot connection advantageously allows the reciprocating mechanism 200 to reciprocatingly rotate the drum 226 about the shell axis y as further discussed below as discussed above the fitting 236 couples to the conduit member 262 in one embodiment the second end 266 of the conduit 262 is configured to removably attach to a water hose not shown for example the second end 266 can have a threaded surface for threaded engagement with a corresponding thread on the.