I made myself a couple of line winders years ago, 1 x rotation equals 1 yard. Every reel spool has backing which is loaded to leave room for 100 yards of line of whatever bs the reel is used for . It is an easy job to either load the spool with new line or measure out 100 yards on the line winders, they come in handy for emptying spools ,as well as reverse loading when a new spool needs backing .
As I do lot of beach and boat fishing as well they get used quite a lot as sea line gets a real hammering compared to
freshwater .
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They are a bit rough and ready, but work well enough.
You can never have enough Pi.
David .