More particularly, the present invention relates to tools, such as plumb bobs, used to establish vertically, or laterally, aligned points with respect to a predetermined datum. The present invention generally relates to tools used in the surveying and construction industries. The invention according to claim 1 wherein said groove engaging means is comprised of a pair of pins fixedly extending through said diametrically opposed apertures formed in said side wall of said receiving portion, said pins further extending through said apertures in said resilient body member's side wall, and said diametrically opposed spring clips are positioned adjacent said top wall of said receiving portion. Iv) a resilient body member having a contiguous sidewall, a longitudinal slit extending through said side wall, a pair of diametrically Opposed spring clips integrally extending from one edge of said side wall, and a pair of diametrically opposed apertures formed through said side wall.Ģ. Iii) means for engaging said J-shaped grooves formed in said knobbed portion and Ii) said side wall having a pair of diametrically opposed apertures formed therethrough I) an open cavity defined by top and side walls Ii) an annularly shaped knobbed portion protruding from said top surface of said body portion and having exterior top and side surfaces, and a pair of diametrically opposed J-shaped grooves formed in said exterior side surface, said longitudinal axis extending centrally through said knobbed portion andī) said reel including means for securely housing said knobbed portion therein, said housing means including a plum bob receiving portion integrally attached to said reel, said receiving portion including: I) an elongated, central body portion having a top surface, said body portion being symmetric about a longitudinal axis extending centrally therethrough and A plumb bob in combination with a reel comprising:
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