Not a real fan of his particular drive but, I have to disagree with Bob on one thing. When assembled there is no visible opening in the bottom of the boiler. If you look closely at the photos you'll see what I call a belly pan. In reality, it's the bottom of the boiler. Everything is enclosed. Replacing the original Pittman motor (one of their cheaper types) does help the running tremendously. I use a similar Canon that pretty much bolts in. Getting rid of the hideous coupling will help also. Bob's highly recommended Toyota rubber tubing works well. Why don't I like the original coupling? Noisy, sloppy, wears out and gets even noisier. I like to replace the input shaft to the gearbox and make it as long as possible. Maybe a 1/16" from the motor shaft and install the tubing.
Jay
