Remove the motor and shaft from the mount.
Put the coupler back onto the shaft.
Drill the 1/4" hole thru the coupler and rod, using the mark you made to make sure the rod is inside the coupler by the proper amount.
The hole should be 3/8" away from the edge of the coupler.
Drill thru both at the same time. You will need some sort of vise to hold it down while you drill.
Double-check that your bolt will fit thru. If not, either re-drill it with a slightly bigger bit, or do another set of holes.
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