Non veni pacem mittere, sed gladium.
What are you using to scan the slides?In the old days Nikon used to provide an adaptor for a macro lens to facilitate copying the(Kodachrome, of course!)slide to C41 or E6 film.I suspect a lens adaptor for current digital camera and macro lens technology would provide output with better focus and resolution than any scanner can dream of.
Believe it or not, we are holding the slides up to the sky, and just shooting with a digital camera, downloading, and then editing to match the original. Seems to be working ok.We tried some sort of gizmo once that fit on the end of the lens, but it was a failure.
Thanks for answering so fully. I liked your attitude.