Nice video.... I totally know exactly what you went through to finally get it to work... You saved me a ton of time with your step-by-step instructions. Thanks so much for your help with this!
The new ring has to be mashed down for the old handle to seat properly. Or grind the handle.d But when you grind the handle it will melt and make the opening smaller which will require a file to open it back up again. You shouldnt be sand the valve, you should be sanding the bottom of the handle.
Of course its not going to work. The red handle is too high to lock in place. You will have to cram the oring down inside. Even that wont work. You will have to put the handle on a bench grind and trim some of it away. LMAO. I just went thru the same thing today.
