It was part of one of the sped up parts, unfortunately, but the driver pins are all "cup" pins, which are mostly hollow to allow the spring to sit further down, making the full stack shorter. The only lock I've ever seen have a security version of cup pins was a specific format of ASSA Twin, which had a single side of a barrel on the end. But that only works because the spool element is so tiny and shallow, and because it interacts with countermilling. Overall it's pretty tricky to make effective spools in this particular case without sacrificing something.

@@CorrectJeans makes perfect sense. Guess it depends how deep the cup goes, I have a bunch of cupped pins on various Goal locks that have spooling or one ended barrel to them (and I think perhaps the Sargent Kesos might as well?). They likely either have counter or overmilling as well.