how to install kitchen faucet with undermount sink

gentlemen I have an undermount sink and granite top and the hole for the faucet is such that, when you put the nut on the faucet stem from below half the nut is on the undermount sink flange. Ideas on how to "shim" the other side of the nut so that the nut is level? half the nut is on the sink flange, half off. In this video, Ask This Old House plumbing and heating expert Richard Trethewey offers undermount sink support by helping a homeowner reattach an under-the-counter kitchen sink to a granite countertop. How to Reattach an Undermount