Description: I have a screw and nut to regulate my CO2 pressure on the regulator bonnet for my 5lb tank of CO2 for a keg. I've always hated that I had to adjust the pressure with a screwdriver. So, I took someone else's design and modified it to be a slip on handle/knob for the regulator. It turned out really well, now I can adjust the tank pressure by hand! Be sure to print this with support with the front of the knob facing down (the default .3mf file should have this already). I've provided the step file and link to the model in OnShape below. You may need to modify this file to fit the width and depth of your own bonnet's screw and nut. Enjoy!

Width of Screw: 8mm

Width of Screw Head: 13mm

Width of Nut: 12.5mm

Depth of Ennire Part: 12mm - Note: This is the distance you need to have between the nut and screwhead in order to slide this part between the nut and screwhead before you push the nut into the part and tighten the whole thing down.

Installation Directions: The whole point of this print is so that I didn't have to take the screw and nut out of the bonnet to install a knob. So, if you loosen the screw entirely (this is the same as reducing the pressure to 0 psi) and then loosen the nut all the way back to the bonnet there should be enough space to slip this knob in over the shaft of the screw. Push the knob back onto the nut until the nut is fully seated within the little nut shaped space on the knob. Then, screw the knob back toward the screw head (with the nut now firmly seated in the little nut shaped spot on the back of the knob) until it starts to get tight onto the screw head. Take a screwdriver and place it into the screwhead and turn it against the knob to make it a little bit tighter. You are done at this point. The end state of this will have the screw head and the nut on the screw compressing the knob into place. The knob can then turn the entire screw which adjusts the pressure of the regulator.

The OnShape file for this is here: https://cad.onshape.com/documents/52430ef66e08729d9d3036d1/w/0980c215718f6b9764e4104e/e/e7a8b6a15cabc4cf698ebd2f?renderMode=0&uiState=663c46d8c8aa8e0e44896354

This is a remix of a model originally made by Filipe Grillo on OnShape. It can be found here: https://cad.onshape.com/documents/7f9d1378f65e77f825939f1d/w/430d6bcfb2424bc65983410e/e/a265171587246f0c094da5f4?renderMode=0&uiState=663c44a046d9f133fbc94c0c