Limiting travel on Iwata Eclipse

OK, the Eclipse is a REALLY nice airbrush, but the needle has about a mile of travel, which makes it hard to get used to for general use. Plus I got the siphon-feed model, which has the .5mm needle (As opposed to the .35mm needle of the other three models).

Is there any way to limit the trigger's travel? On my Paasche VL you could just thread in the spring nut, but that doesn't work on the Eclipse: The nut just bottoms out.