The solution was to fit a new PTFE head washer, part number 50-055. Once fitted the problem disappeared and the 'brush was back to normal. Luckily I had a washer in stock, and I'll be ordering a new one soon. The same part fits the 100 and 200 (but not the 200NH) so if you have one of those airbrushes it would be worth keeping a spare head washer handy. It might not be the solution in every case, but its a good start.
I measured the widths of the old and new washers with a micrometer, the old one measured 1.2mm wide and the new replacement 1.33mm. The original one was about 12 years old, I bought this 'brush in 2008.
Paul.
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