uhh...i was under the impression that construction keyed locks have balls in them, this has been stated thus far, however, you are all missing one thing.
that is one ball. and it is friggin huge. construction balls are way tiny, in fact there was an arguement between i think raccoon and octillion or raimundo or someone about how many of those balls can fit into a pinstack and only take up one space on the depth chart.
maybe im missing the size difference in the blurriness, but i think if that was construction ball, it would be hella smaller than that.
schuyler- is there a second set of holes parallel to the pinstacks in the plug? ones that are slightly smaller than the pinstack holes? there should be if it is constructin keyed, if there isnt a second set of holes, then that is a wear and tear ball or something else.
lemme know if that doesnt make sense, i can post pics.