...has been available for just a little over a year, and it's been suggested that there might be interest in a short post to document disassembly and recalibration of this simple little part as an owner might do it - from start to finish - with no special tools. So here it is.
Disassembly begins by simply sliding out the dowel pin key with the tip of a sharp screwdriver. This step is easiest if the force on the piston from preload of the regulator spring is removed by dialing the adjustment nut to a low pressure setting (see diagram near end of post).
Having the seals, springs, and parts laid out for inspection provides an opportunity for replacing any that look worn. In this case they were clean and in perfect condition, I just assembled them in the correct order on the Piston/Stem, and slid them back in place, followed by reinserting the dowel pin.
The next step is to restore the PSI calibration setting.
This is easy to do with the AoA regulator, because a default baseline calibration of 1000psi (69bar) is built into the design. All that's necessary to set it, is to reach in through the adjustment slot and rotate the adjustment nut "star wheel" toward higher PSI until the slack just disappears from the disk spring stack and turning resistance is felt. In one step this compensates for production variations in the height of the disk springs and regulator housing, resulting in a preset pressure accuracy of about +/-5% = +/-50psi.
Final testing was done in the most graphic and conclusive way I could think of. I installed it in a handy .22 12fpe Disco (AoA HDD, Power Adjuster, and lightened hammer), filled to 2000psi, and did a shot string until the gun came definitively off the regulator.
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