Most guitars these days come with slotted pins - heck, I didn't know there were un-slotted ones until recently. Collings is a notable exception, their bridges are slotted and it's worth mentioning that Martin used to do it. Over at the unofficial Martin forum, it seems a lot of folks retrofit their guitars with slotted bridges/un-slotted pins. What does TGP think of this mod? Worthwhile or snake oil?