It will usually screw right out of the regulator body and a new knob will screw right in. Some of these have a slot cut at the end of the threaded stud and there is a clip inside of the regulator body that fits in the slot to keep the knob from coming all the way out of the body. If this is the case the regulator will have to be taken apart, just remove the 4 screws and disassemble the regulator, run the knob down and remove the clip and unscrew the knob out of the housing then screw the replacement knob into the housing until you can get the clip on and reassemble the regulator. Be sure to be cautious when disassembling the regulator, relieve the spring tension with the knob and note how the assembly comes apart so that reassembly will be correct.

I have noticed that the newer regulators do not have the clip and the knob will screw in and all the way out of the unit. (Note: this assembly is very cheap and easily destroyed by someone with a heavy hand).

There is a video about this unit if that helps (on www.mastertoolrepair.com ). I think that the clip is discussed and shown in it.

Hope this helps!

- MTR

The video was made to bring attention to issues with the manifold and regulators. There are no user serviceable parts available to repair these manifolds that I am aware of, unfortunately. If you have an issue or problem with the part the best option is to replace it. I don’t think there is any breakdown of these manifold/regulators that detail the assembly because they are not considered repairable.

If someone should want to attempt to repair one, then the best course is to disassemble it in a clean clear work area and lay the parts out as they are removed so that reassembly will not be difficult. Per the manufacturer these units are not serviceable or repairable.

- MTR