After flying was cancelled this afternoon I hit the workshop. The intention was to get the speed setting worm and worm wheel fitted to the governors. Holes were drilled and rods made, and 1mm holes cross drilled for split pins. Having stupidly made the worm wheels to the drawings some while ago I now know they don't fit; and can't possibly fit. I had a perfunctory go at making the existing worm wheels smaller – failure. So make some more blanks, diameter roughly according to an integer number of teeth. Dug the previous fixture out of the box and started machining. Bogged it up, so had to make some more blanks. Messed two of those up; made two more blanks. Why is it the bog ups occur when using expensive material? This time the machining of the worm wheel teeth went properly:

Worm wheel is about ½" diameter and the spiral flute tap is 7/16" UNC.
More holes were drilled to fit the worm and worm wheel:

I think that's all the holes drilled in the governor body, so after I've tidied up the speed setting worm and worm wheel I can get on with other parts.
Supper now calls; chicken chow mein. The chicken has been marinating in soya sauce and chillies for the last 30 minutes. Time to hit the wok!
Andrew