substantially equally length probe guide tube 910 includes two leaf spring prongs 812 and two opposing thread prongs 814 a and 814 b which are about half as long as the leaf spring prongs and which include respective cleats or protrusions 815 a and 815 b to better engage with threads 113 a on probe body 110 u2032 and thus better ensure the desired perpendicular alignment with sheathing surface 101 a fig1 shows a profile view of an alternative exemplary drywall bore tool 1100 which is similar in basic function and structure of drywall bore tool 600 in fig6 with the exception of some added features to ensure higher precision boring and efficiency bore tool 1100 includes a handle portion 1110 and a slotted cutting tube 1120 a bore guide plate 1130 and a bore guide ring 1140 handle portion 1110 includes a stem portion 1111 which is fixedly mounted for example threadably engaged adhered or welded to slotted cutting tube 1120 cutting tube 1120 which is made of a durable metal such as copper bronze steel or aluminum or a suitable hard and durable polycarbonate or other plastic includes a sharpened cutting end 1121 and a longitudinal slot 1123 the longitudinal slot runs to the top end of the tube to allow full assembly of the tool though this is not visible in the figure because of handle stem portion 1111 bore guide plate 1130 includes a bottom face 1131 with protrusions 1132 to engage the.