Generic Air Rower flywheel magnet holder

This is a holder bracket for 3x3mm neodymium magnets (up to 6) that used with the [ESP Rowing Monitor project](https://github.com/Abasz/ESPRowingMonitor) to upgrade my generic air rower (actually a cheap Concept2 clone) with more accurate metrics. 

The bracket is sized for this specific [rowing machine](https://www.aliexpress.com/item/1005002302662579.html) but I uploaded the fusion 360 file should anyone need to change some sizes.

This is a fairly easy print only tolerances may pose a challange. By design there is only 0.1mm tolerance on the magnet holder holes so they are tight fits (I did not want them to be glued in permanently).