My dad is very much a go-big-or-go-home kind of builder.
Last time I “went home” he gave me a thread holder.
I wanted a thread holder to use bulk thread in my sewing machine. (Hopefully my fussy Bernina diva will cooperate!) I have always admired my Mom’s thread holder that Dad made because it is very sturdy.
The holder is welded to a solid steel block. You would stub your toe on it before knocking it over!
I do not know how well it will work on my sewing machine because I got sidetracked. I have my thread holder rigged as a ball keeper/yardage count.
I place my flat center-pull balls on the thread holder. I weave the thread up to the line meter that I attached to the hook.
The line meter was purchased from a bait shop. It is perfect for measuring yardage. I love to write crochet patterns but my readers have been frustrated because I don’t provide yarn yardage. Now I can still use recycled yarn, but still write an accurate pattern.

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I really love your scientific approach – way to go!
A somewhat more inaccurate method is to weigh the finished project.
If you find a similar yarn at a store and you know the weight and lenght of that you can make a rough estimate.
In the knitting pattern book (leaflet) from my grandmother’s days I see that even if the yarn was handspun they had very exact weight estimates for socks and mittens.