A great start to being able to use a string pot sensor is here. This kit comes with the enclosure where the potentiometer and spring tensioned wire meet.
A portion of the proceeds of this sale will be given to Chap Robotics FRC team 2468, who developed and used this idea on their competition robots.
Included Hardware: Three - 4-40 x 0.75" Screws (to seal the enclosure) One - 4-40 x 3/8" SHCS (to capture the potentiometer shaft) One - Retractable String component One - Precision Potentiometer, 10 turn, 5Koh One - String Potentiometer EnclosureNote: With the retractable string provided you will only be able to get about eight to nine turns out of the ten turn potentiometer. To get the full range, use the spring from the retractable string component and a 30" string instead.
Assembled Version using modified FRC Team 2468 3D Print Files
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