TT Geared Motor with Encoder (6V 160RPM 120:1 L Shape)
https://www.dfrobot.com/product-1458.html

To be used with:
https://www.dfrobot.com/wiki/index.php/Micro_DC_Motor_with_Encoder-SJ02_SKU:_FIT0458
https://www.robotshop.com/uk/type-s-load-cell-100-kg.html

The spool is acetone-welded.
The motor is zip-ties mounted.

With a load cell mount for tension sensing.
The tether is made out of nylon and is guided by teflon tube.