Brief Description: Match drill seat through seat hinges.
The seat hinges are drilled to the seat. 3 each side. The forward 2 hinges are located by simply using the dimensions from the drawing. The aft hinge has to be located directly on top of 3 existing holes in the seat. Image 2 shows the first 2 hinges on the left simply line up to lines. The third hinge on the right you must locate the hinge by viewing the line through the hinge holes. We’ll be back drill the hinge through these existing seat holes.
I clamped 1 side of the hinge and held the other side by hand and drilled right into my bench top. Seemed to work fine.