I had two robin 6hp engines and one hypro D30 pump stolen from my spray rig. I don't know why they left the other pump. I was wondering what drive I should use to connect these. It looks like the manufacturer used a some sort of straight coupling which I only have the half attached to the pump. What is the best method to connect the engine and pump. I have seen the gear reduction coupling at rittenhouse or is there something cheaper and just as effective like the manufacturer used. Also, what engines would you get. I can get the same robins for about $100.00 cheaper than Honda's. and they would bolt back in the same holes if I knew what coupling the manufacturer used. Also I have seen honda engines with a 6:1 gear reduction for about $80 more. Would this replace the need for the rittenhouse gear reduction. Also did the manufacturer screw up when they direct drive connected the robin EH17 engines to the Hypro D30. The Manufacturer (Ketchum Industries)is no help they do not answer there phones or respond to messages.