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Peter, pillars are just that...pillars. They're metal inserts in the stock where the actions screws go. The bottom of the action mates with the top of the pillar and the bottom of the pillar, of course, is mated with the head of the action screw. Brownell's sells pillar bedding kits and you could see a picture there to give you a better idea of how they work. Just use the "search" feature on Brownell's website.
When you take the stock off your Sendero, you'll see a solid, one-piece aluminum bedding block on which the action sits. Judging from the picture that you posted, you got a real shooter. Reducing the trigger pull will make it even better. If you follow the instructions for adjusting the trigger, you'll do just fine. It really is simple.
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