Aikenn, the way I do it is counter bore a hole in the bolster to cover the pivot pin head, you have another screw next to it, it that the stop pin?
I put the bolsters on first, usually dovetailed for the scale and use 0-80 screws into the liners.
then install the scales. here's three pics to show it, they just cover the pivot pin, for stop pins I use 3/32 hardened pins that are flush with the outside of the liners. hopes this helps you.