If your needle chucking guide has a groove cut into the cylindrical barrel (as indicated by the red arrow in the image above) and your airbrush body has a screw underneath to hold the chucking guide in place, then you need this old style of auxiliary back lever as a replacement. The needle chucking guide depicted above is a separate item.
If your needle chucking guide has a cylindrical barrel with no groove and your airbrush body has no screw underneath to hold the needle chucking guide in place, then you need the new style of needle chucking guide with auxiliary back lever, which comes assembled with the auxiliary back lever attached. The link is to an Iwata needle guide with aux back lever that fits.
For more information or advice on this product, please call us on
+44 (0)1903 767 800 or email firstname.lastname@example.org
This image above shows the needle chucking guide - NOT the back lever. See explanation above.