It’s that time of the year..Champions are made ..
The pillars are steeped to grab the stock shoulder inside the hole that’s counterbored and then the bottom of the pillar first shoulder base.
The top (outside of stock end ) of the pillar is chamfered to accept the 5 mm machine screw that all HW USE. It’s recessed just below the wood surface so you have a flush flat head clean look with no metal showing.. I DONT LIKE SEEING METAL RINGS AT MY MOUNT POINTS.

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SO YOU HAVE 4 solid contact points. The end of the pillar flush to the bracket , (the inside the stock) , the chamfered inner top to catch the flat head Allen screw.
The shoulder inside the stock counter bored wood.
The sides fit to the stepped counter bored stock That STOPS WOOD ELONGATION. THE PILARS END IS FLUSH WIITH INNER FORKS ON THE STOCK TO STOP THE FORKS FROM RUBBING THE BREECH EVER, AND THE SHOULDER ON THE INNER STOPS THE FORKS ON THE STOCK FROM PULLING THROUGH .. THE 5 mm screw pulls it down together as tight as can be with no wood crush ever .. Since the pillars are flush with the bracket hanger and just under the outer forearm of the stock , you can’t screw any more than the pillar . Retaining the strength laterally and into the action..
View attachment 429674View attachment 429675these are for another stock but exact principle. Actually a (Longbow

) sorry bout the caps ,forgot they were locked and I wasn’t retyping.
View attachment 429734that goes into the counterbored hole, and then it’s chamfered like the pic. ,just under the stocks surface for a flush screw to stock fit.