After drilling the primary gap, transfer the board, drop the indexing pin into the opening and drill the following gap. Repeat the method for an evenly spaced row of holes.
The indexing pin must be the identical diameter because the holes you need to drill into the board. Other vital dimensions on this venture are the gap from the fence to the bit, to ensure the holes are drilled into the board in the best place, and the gap from the indexing pin to the drill bit. That dimension dictates how far aside the holes will probably be.