vary depending upon use as shown in fig5 b the central hole 42 has a diameter of about 6 4 mm and the skirt 43 is about 7 6 mm high the diameter of the top crimp member 40 is about 20 mm the top crimp member 40 also has a cover 44 which covers the central hole 42 when not in use but can be pulled or pealed back when in use also while none of fig5 c through 5f or fig6 show a cover it is understood that each of these embodiments can employ a cover if desired fig5 b also employs a bottom washer 41 the bottom washer 41 contains a central hole 45 the bottom washer central hole 45 can have a diameter greater than the same as or smaller than the diameter of the central hole 42 in the top crimp member 40 as shown in fig5 b both central holes 45 42 have about the same diameter i e about 6 4 mm the bottom washer 41 does not have a skirt the diameter of the bottom washer 41 is about 20 mm when used the bottom washer 41 is placed below the top crimp member 40 and both are crimped into place crimping is preferably performed via an automatic or semi automatic crimper which is discussed in more detail below in.