I have a new unused STL adapter made by Astrophysics that bolts onto the front of your STL camera creating a maximum opening that has least vignetting.
I have also cut down 4 screws that are the right length for the STL camera.
It is 43mm long and 82mm female threaded end which is a standard
AP thread used by many accessories.
http://www.pbase.com/image/108969911
$100.00 + $10 shipping.
Paypal or direct debit.
Greg.