If you have cats that love the outdoors but you just can not let them out try Cat TV on Youtube it is awesome and they love it ..
https://www.youtube.com/live/UEyEs8AE1ss?si=WUoZWXOF-NC3-3h4
how about a build list and a how to make this magneto speed rig many still out there just can,t afford the ew garmin but can still get use out of theirs