15-Oct-07 Finishing the Crosshead guide yoke. Although the first holes were easy, the same holes on the bottom (of the picture) were more of a challenge, since we could not get a center drill in the correct position from either top or bottom. Drilling a smaller hole in the top, we used a number-size center punch to spot the holes on the bottom. Using a 6" long drill through the top hole, the bottom holes are quickly finished.