Let me suggest that the arms be cut approximately 4"-6" longer than listed below. Then prior to attaching the top plate to the arms, attach the arms to the finals, loosely mount your top plate, get your PHD set upon the plate, and connect the PHD to your particular drive setup from the PTO (because that distance may vary). Once all that is set, then you can accurately mark the mounting hole locations into the top plate and cut off the arms to be flush with it.
All connecting hardware is 1/2" (top plate to arms), while all implement mounting holes are 3/4" (final drives and top plate).
Drawbar consists of (3) items:
- Left arm: 3"x2"x1/4" thick angle iron, 20" long (suggest 24" or 26")
- Right arm: 3"x2"x1/4" thick angle iron, 20" long (suggest 24" or 26")
- Top plate: 29-1/4"x4"x1/2" thick top plate
Each arm lines up with and connects to (3) bolt holes in each final drive, starting from the second hole from the front (as seen below, from left to right):
The hole measurements should be taken from your own final drive to ensure alignment, but all Cubs are standard. Starting from the end opposite the top plate, the first hole is 1-1/4" to centerline, then 6-5/8" and 9-5/8". The cutout open space for the final drive hub is 2-3/16" from the end and about 3-1/2" long. The cutout is about 1-1/2" deep at its elliptical center.
The top plate has (2) holes that line up with your PHD's base. Use that to align and measure the holes once your PHD is temporarily in place and connected to the PTO.
The other holes are just arbitrary connecting bolts/holes that hold the top plate onto the arms. They are set back from each edge about 1".