It was mentioned that you can get the adjustment shims at McMaster Carr. I searched and couldn't find the specific listing, does anyone have the part number? I don't think I'm THAT cheap that I couldn't buy the kit, but I was a heavy equipment mechanic for about ten years and still have all my tools, gauges, hoses ect. for testing and I don't really see a need to buy more. I am not a fan of cranking the pressure to the sky to get more work done, I have seen it too many times in the past. I have read enough on these little tractors [BX] to also know that the manufacturers lean toward the lower side. Saves on equipment and if it's not needed, no sense being so hard on things. But, there is no harm in making sure it is where it is suppose to be and as long as you keep it reasonable, tweeking it up a bit. I'm talking a couple of hundred psi, not up to say 2,500.