I had a Royal Aqua-Master nozzle that would not hold a consistent IP pressure. I polished the volcano orifice and had tried using two different brand new Conshelf XIV Teflon high pressure seats but still the IP pressure keep creeping up higher and higher.
So I sent the nozzle down to Tom and he discovered scratches in the spring block (USD part #1053-24) made by a pick or other sharp object possibly when removing the 0-ring or nylon backup washer…..I will not discount the fact that I could have done this myself
Either way the scratches were deep enough to allow air to pass by and the 1st stage remained in an unbalanced state. He installed another spring block I had that was scratch free and the unit works great. Hope you don’t run across this problem with your RAM but thanks to Tom we have some info that might cut down on troubleshooting time.