Align cartridge to offset cantilever ?

Hello, what to do when aligning a cartridge with the cantilever slightly offset ? All I have is a geo disc to use. But following their instructions to align the body to the grid, and the next step is to look if cantilever lines up. Obviously it does not as it is slightly offset as I said. Should the cart be slightly offset from the grid, so the cantilever is straight with the grid, as apposed to the body ? Obviously you cannot have both.