This is how I made my own Axle bar and Loadable Dumbbells. You will need schedule 40/80 1.5" nominal pipe, my 3d printed parts from my Etsy store, Strong glue like gorilla glue, allen wrench and a drill bit if you choose to drill out the holes.
Video that inspired my own build from Brian at neverstate    • DIY HOME GYM UPGRADE! Axle Bar & Dumb...  


Etsy store link https://www.etsy.com/GreenHornGarage/...