I line the blade with cardboard or leather and place it in a vice with cutting edge down and tip away. Then, as others described use Wiha hex or Allen bits.
Often, one fastener has red Loktite and the other blue. Thus, only one screw will break free.
After removing the first screw, the spacer should push through. If it won’t, use an appropriately sized dowel or rod and light taps w/ a mallet to push through.
Remove the second screw and take care not to let the scale drop. (Damaging the scale sucks !

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Personally, I prefer to have replacement fasteners on hand. All sizes and colors can be ordered from Jo or traded for. Be sure to keep track of the original spacer and screw position since some are longer than others.
If you’re reusing the old screws, wire brush the old gunk from threads and mouth of spacer. If not, add one drop of blue (medium) Loktite to threads and re-install.
Enjoy your sexy new scales and/or fasteners !!!

PICS OR IT DIDN’T HAPEN.
