The rubber nozzle washer (which sits behind the nozzle/tip and keeps the paint and air separate before it's mixed) on my Aerograph Super 63 looked to be worn. My Super 93 came with a PTFE washer, and a bit of research online suggested that PTFE was a better choice of material being resistant to solvents. However, availablity of these is a bit hit and miss, and as had some PTFE bar in stock I turned my own.
It can be seen in the photo below, the white washer sitting below the black rubber one it replaced;
It measures 4mm x 1.08mm wide drilled 2.2mm, and does the job quite well enough.
Paul.
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