A hardwood shim, preferably ebony, glued to the bottom of the saddle is even better than a credit card, Breezy. And if necessary you can lower the saddle a tad by sanding the now-shimmmed bottom on a flat surface, exactly as you would a non-shimmed saddle. No chisels or razors necessary and no finger-ends lopped off by ham-fisted amateurs like me! LOL!

It has the added advantage of making the card easier to use when you need money out of the hole in the wall! :-)