Astrozap
Like this:
http://www.astrozap.com/scripts/prod...?idproduct=267
Looking for AUD$50 + shipping, or can drop to the Upper Blue Mountains.
Worked beautifully on my C9.25 Edge HD which is also up for sale in the telescope section, along with a Canon 10D and Sony planetary camera etc.
Blurb:
Unlike a simple Hartman or Bahtinov mask, the Astrozap focusing cap is a multi-purpose tool which allows for quick 'shutter-like' operation. Just turn the wheel to the open position for focusing, and then turn it again to the closed position to keep the dust out, or to image dark frames with your ccd or dslr camera.
Simply turn the thumbscrew to the open position, and turn to close.
No plastic plugs required, and no tools needed.
Astrozap focusing caps are made from lightweight aluminum and powder-coated texture black.