527,247. Wall centering. EDWARDS & CO. (WHYTELEAFE), Ltd., J. B., and KEER, E. W. April 5, 1939, No. 10593. [Class 20 (ii)] A spacer for shuttering comprises a rod, a sleeve b with securing bolt d at one end, a clamp in the form of a sleeve e also with a securing bolt d, and an adjusting sleeve f adapted to screw into and out of a portion e<SP>2</SP> of the clamp with an enlarged diameter.