adjusted to accommodate different wall thicknesses by threadably retracting and extending the foot 64 on the shaft 61 alternatively greater variations in wall thickness can be accommodated by providing different clamp brackets 52 with various spacings between their respective extension legs 56 a b for example wall thicknesses can vary considerably depending upon their construction with studs of different widths stud widths varying from 1 u00bd inches to 7 u00bd inches are common clamp brackets 52 a b for various wall thicknesses can be provided for interchangeably mounting on the base 40 as needed fig6 shows an optional configuration of the tool 10 with spacers 70 mounted on the base outer face 37 by screws 72 extending through receivers 74 formed in the base 40 at regular intervals the spacers 70 space the base 40 inwardly from the trim pieces 22 24 to clear a door stop trim piece 76 it will be appreciated that the spacers 70 can easily be installed and removed as needed and different thicknesses of spacers can be provided to provide clearance for different thicknesses of door stop trim pieces 76 the level 44 includes a total of three orientation display assemblies two end display assemblies 102 and a middle orientation display assembly 104 mounted in the level 44 each display assembly 102 104 includes a liquid filled tube 106 with a bubble 108 the tube 106 being mounted in an annular rum 110 and extending more or less diametrically thereacross the rims 110 can be rotatable for reorienting the tubes 106 the level 44 can comprise a standard commercially available level of the type commonly used in construction the overall length should preferably be under six feet in order to fit within commonly.