Fixed to draggable

I have a graph that dynamically changes the bounds depending on values entered in a table. Specifically, the graph plots the inputted low and high estimates on a number line. I want a draggable point in between the low & high points. I can place it there by defining a place (ie value), but then I want to release it to be draggable. How do I take a point that has an initial fixed value and make it draggable after a student does an action (eg. input their final estimate in an input box)?

I figured out a solution by using a variable in defining a slider limit

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