Stu,
thanks for the nice comment.
Trev,
it was balanced dynamically. Usually this is nothing to pay out of petty cash, but my engine reconditioner allowed me to use his machinery during an afternoon when he didn't need it, so all it did actually cost was some hours of work and a crate o' beer for the staff.
muskrat,
I didn't have any oil in the galleries and the sludge trap, but I calculated the weight of the oil in there (volume of the sludge trap hole and galleries less the sludge trap tube and plugs, multiplied by the specific gravity of the engine oil at 80°C) and added it to the rotary weight of the bob weights (more calculating, less oily mess
)
This makes quite a difference, I seem to remember it was about 25 to 30grams.
See, you won't catch me on that one!
Cheers, Markus