viewing the alignment of holes 27 and 29 a seal 10 that cannot be fixed with the holes 27 and 29 aligned should be investiated for tampering improper assembly etc fig3 a shows a modified strap 12a having a number of parts similar to those on strap 12 in fig3 like reference characters in fig3 and 3a correspond to similar parts strap 12a includes ends 20a 22a holes 25a 26a 27a 29a 30a 35a central slots 28a 32a and fingers 23a 24a 33a 34a corresponding to similar parts on strap 12 holes 36a 38a formed in fingers 33a 34a respectively are of a size and spacing equal to that of holes 25a 26a on fingers 23a 24a for a purpose to be later described platform 16 is preferably stamped from a piece of resilient sheet metal fig4 shows a plan view of platform 16 after being cut but prior to being bent into its final shape platform 16 includes a first leaf 48 and a second leaf 50 joined by narrow frangible joints 43 45 an elongated slot 60 extends through a portion of leaves 48 50 and between frangible joints 43 45 joints 43 45 are described as frangible because they are made substantially weaker than the other parts of platform 16 joints 43.