CAD designer

to design a snap on, snap off free weight that can hold up to 20 kgs or as little as 1 kg. It needs to be compact and transportable with easy to clip on and off weights. Product similar to this but that can be stored in a nag and carried around easily: https://www.phonelook.ch/de/verstellbares-hantelsystem-2-24-kg-rockbells.html?language=de&currency=CHF&gclid=Cj0KCQjw2tCGBhCLARIsABJGmZ7jfKZ5Mfnf8HheuK0tZhqaVF7AI8MjTlRpKpVwFSkaqozXlEEfREUaAmDgEALw_wcB