I use it almost every day, but the way I tell if the aperture is a problem is if the compressor can no longer keep up. So far so good. But good advice. I have another one too. You never know.

Deve

1950 Chevy 3100 Deluxe Cab
1950 Chevy 3100 Standard Cab
In the Stovebolt Gallery
The Think Tank
More info and tips at Deve's Technet