OK steelvibe, here it is.
I have installed all the 3d printed tuning knobs now and just put the OF-660 on my dodgy old kitchen scales.
The new weight is 4 ½ lb. So it has shed about a pound. It is definitely noticeable, and an added bonus is that I really like the look with the black tuning knobs and the highly visible carbon weave.
But it's still too heavy for me for a bikepacking trip. Oh well, I'm glad I had this weight loss journey with my Journey anyway.