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Mini-pillars may work for the short run, but the wood may not resist heavy screw pressure and spreading caused by round actions.
It's important to pillar-bed laminated stocks, especially on round actions, because we've evidenced stock-spreading, apparently due to the relatively soft birch used in many such stocks spreading, perhaps from action screw force, or shrinkage.
I use 1/2" steel tubing obtained from Home Depot, etc., because it fits within trigger guard/floorplate dimensions, so stock surfaces aren't damaged by installation.
In the past, I've made drill bits from the tubing or portions of steel golf course shafts that are slightly larger than the pillars. More recently, I bought a Forstner 1/2" bit that bores clean holes in wood, but the pillars are a bit tight in them, so I open the holes a bit with a round wood file, and epoxy them in. Holes are started from the bottoms, to prevent splintering exterior surfaces.
(A full action-length epoxy-bedding job and free-floating completes the work.)
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