Hint: (applies to pretty much all security pins and their pinning) for a fun exercise (and something I do when building challenge locks) put all key pins into the core, and then stack the security driver pins on top — you now have the key pins and drivers sitting just how they would in the lock’s neutral/locked state (sans the extra pressure from each stack’s springs). Now look where each, say spool, sits — if it’s paired key pin is a really short key pin then the spool will sit deeper in the core, which will pick differently compared to a spool that is sitting atop a really tall key pin — there might only be a mm or two in order to reach the shear line.
If the double-spool you had pictured above were sitting on top of medium–high cut pin it’s quite likely that if it were installed as in picture #1 the spooled sections of the pin would
never come into play, as it would never even sit in the core in the first place, effectively turning it into a standard.
Image example — note the “spool” driver in position #6, compared to the spool in #1:
and now note how they sit on their respective key pins — #1 key pin is really tall; if I were to put spool #6 in position #1 I’d waste the entire top half of it, as it would sit above the shear line in the locked state:
(:
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Sun Feb 14, 2016 2:18 am 
