Originally Posted by
sharptonn
Simple old mechanics when using ever changing natural materials. The big old tapered tangs would wedge into and spread the scales on the way in on both sides and align the scales to the blade. The sloppy hole allowed for some movement, keeping things from binding-up.
If you bush the pin-hole and add spacers, none of this works anymore as the tang no longer spreads the scales and the blade cannot 'float' in them. Just a simple hinge at that point. Also friction loss by adding the spacers, no more tight pivot.
I have done it, had problems. Undo it, problems gone!
YMMV