Paragraph Number

69

Thus, the counterclockwise (loosening) rotation of the screw 302 may be limited to, at maximum, an angular displacement equal to half the angular width of the sector occupied by a single raised ridge 216 of the head 210. This amount of counterclockwise rotation of the screw 302 may be sufficient to cause the raised ridges 216 to engage the radial grooves 116, regardless of whether the raised ridges 216 were aligned with the radial grooves 116 as loosening began to occur. Any additional counterclockwise rotation may be blocked, as it would urge clockwise rotation of the rotatable structure 112, which cannot occur due to abutment of the corresponding surface 124 of the arm 114 with the flat surface 122 of the partially circular recess 120, as described above.

Added by DJM 5 2021