An improved apparatus for maintaining the lance portion of a coating device accurately centered within the bore of a tubular conduit to be coated as the lance is moved axially through such bore. The tubular element of such coating lance is supported by a saddle which in turn is supported between two elongated skids which are respectively engageable with opposed top and bottom surfaces of the conduit bore. Radially projecting pins are respectively provided on each side of the saddle. Two pairs of expanding links are respectively pivotally mounted on each end of the saddle pins in an X configuration and one end of each link is pivotally connected to a pivot mounting bracket formed on one of the skids. The other ends of the expanding links are slidably engaged with the internal surfaces of the mounting brackets so that the expanding links may be moved from an essentially horizontal position, wherein the skids are collapsed adjacent to the lance supporting tubing, to a more upright position wherein the skids are radially expanded relative to the supporting tubing. Expansion and contraction of the links is respectively accomplished by actuating elements secured to the tubular portion of the lance in axially spaced relationship relative to the common pivot points of the expanding links. One such link actuator causes the links to collapse when the lance supporting tube is moved in one direction and the other link actuator causes the supporting links to pivot to their expanded position when the lance supporting tubing is moved in the opposite direction.