Using the RJ Q>110 lens adapter found that my standard aperture discs from the Lensbaby Composer/Control Freak/Muse/2.0/3G fit absolutely perfectly into the back of the RJ adapter. There is a ridge in the adapter that the LB discs friction fit up against. You must put the discs in from the back "camera" side. This means removing the adapter from the Q body, but it is no big deal. This places the aperture between Q and 110 lens. To change disc you remove adapter from body and use a small hook ( mine is bent from a paper clip) to remove. You can also forget hook and take lens off to push finger thru adapter.
In a very quick trial found that f11 disc seems to give approx a full step aperture decrease. About f4. Haven't played to find the next step because Q doesn't like to be closed down much due to diffraction.
Added a couple of pics to illustrate the setup. If you don't have a Lensbaby, shame. They do sell the aperture discs seperately.
thanks
barondla