I designed this tool to carry my recurve bowstring without tangling or unwinding. Has two prongs to adjust length as needed to not fold your middle winding.
If your String has custom lengths that do not fit with the current size, i included the step files so you can make adjustments yourself

How to use:
Adjustment is only needed first time or when you wind your string.

Put lower loop around left knob, wind string around lower knob and ajust distance of left knob until your middle winding sits on the carrier without beeing folded. Now make one last winding around the left knob and wind the remaining string around the right knob. Adjust the right knobs distance until you can hang the upper loop over it (or the lower knob) for the string to sit tight.