Hi again, I am down to my second last part for the disassembly of the 787 in my challenger. I took apart my pressure regulator for a look and I can see that the previous owner replaced the bottom clamp with a zip tie and repaired the bellows with something. I plan to replace the bellows, but I also noticed that my valve did not have the 3 washers as shown in the parts diagram (#34). I guess they would add more pressure if they existed. Do I need them?