![]() The plumb bob of claim 1 wherein the shell and the metallic core define an axial bore.ĩ. ![]() The plumb bob of claim 6 wherein said plastic shell is a high visibility color.Ĩ. The plumb bob of claim 1 wherein said plastic shell is comprised of an opaque polycarbonate.ħ. Said flat surface forming a mating surface with said shoulder and with said shoulder defining means for resisting relative rotation of said support collar relative said shell.Ħ. The plumb bob of claim 4 wherein the frustoconical plastic shell defines a shoulder at its smaller end adjacent the threaded boss and further wherein the support collar includes a flat surface at its larger end The plumb bob of claim 3 wherein the relatively low-density frustoconical plastic shell defines at its smaller end a threaded boss adapted to receive the second axially threaded counterbore of the conical support collar.ĥ. The plumb bob of claim 2 wherein the conical support collar defines a second axially threaded counterbore.Ĥ. ![]() The plumb bob of claim 1 wherein the means for affixing a pointed end includes a conical support collar, said support collar defining a first axially threaded bore.ģ. Said plastic shell having a continuous smooth surfaced knobbed extension at its larger end adapted to receive a flexible support member on said axis.Ģ. Means for affixing a pointed member to said relatively low-density frustoconical plastic shell at the smaller end thereof and coincident with said axis A relatively low-density frustoconical plastic shell defining an axis and surrounding said metallic core
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