I had not open your file! :)
Now i have seen it! :)
So my solution was maybe not adapted! :)
But you can keep this function for another thing! :)

You can also use another tricky function : my favorite for this sort of thing! :)
The Transform /Orient / Line-Line
Say you know some line's length of the original object
Here line from Center diameter of each extremities of your object
Draw your final length wished

You have direct result Line - line / Uniform with 4 clicks :)