Gym Machine Knob (fits M8-1.25 nut)

thingiverse

Have you ever gone to the gym and noticed that the gym machine is missing the knob to adjust the seat position? Now you can bring your own... This model fits a M8-1.25mm nut. This is the size nut that fit the machine at my Retro Fitness that was missing a knob. It's a tight fit so please make sure your 3D printer is well calibrated before printing it. You'll likely need to sand the second part down a bit to be able to fit it in the well and lock the nut in place. I used a 2lb deadblow hammer and a hex bit extender to get the nut in place. I then used the deadblow hammer by itself to get the remaining two pieces together. I used a file on the outside of the knob to add some texture to it so that it would be easier to grip.