Here's the drum before adding the sleeve.
Here the sleeve in place. The saw kerf when I cut the pipe in half made for a very tight fit. It took two vice grips and a lot of pressure to bring the two halves together to weld. I run a light rod, at light heat, so I didn't damage the aluminum drum, when welding the halves together. Filed the welds smooth and drilled a dimple in the drum, through the set screw hole, and tightened in a set screw to insure the new sleeve doesn't turn on the drum. Old diameter 1 1/4", new diameter 1 7/8".
So time to try it again. This time the feed worked out to a little over 14 fpm. Awesome, I could get more out of it , but I don't see any need to work the engine any harder. If I am not careful I could bury myself in lumber pretty quick, if I can slice a board off an 8' log in 40 seconds. If I want to go faster on small diameter logs, I can disengage the winch and feed by hand as fast as the blade will take it.
Did a walk around the frame. A few of the cable clearances were close or touching some of the cross members like the front and back of the carriage when it was at the ends of its travel. Ground clearance notches where required.
Here is a picture looking down on the mill.