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If the length of rod is slanted, Use a pin-vise with a 1/16 drill bit to saw and twirl 'til you get a straight result.
Go a little more.

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Mock it up with your blade and nutsy-bolsies. ...

Take the pic again with the scales straight up and down. Straight-on

Put a length of rod through the pivot holes and then hold it up pivot end up. Take us a picture?
Look. Anticipating...:popcorn:

Scales with inlay on the front sometimes will shrink more on the rear scale than the front.
Also, the front with the inlay will sometimes bulge out.
If the rear scale has shrunk more than the...