A supply voltage is divided to provide a divided supply voltage. Cementing slurry is pumped through the cementing tool to fill an annular region around the casing assembly. The link assembly includes a plurality of bending guide members configured to support the bending area, a plurality of link parts connected to both ends of each of the plurality of bending guide members, and a plurality of link connecting members respectively provided between the plurality of link parts, and configured to connect two adjacent link parts. The support posts and the base are reconfigurable between a first position in which the support posts are angularly spaced from the base and a second position in which the support posts are adjacent the base.