Took a page off @Aaron28 book - got my K mount Focal x2 converter and took the elements off so I can use the converter as an extension tube.
This was at 1:1 - with the "extension tube" I think I am getting 1.5:1 - I do not think it is 2:1... I do note that I lost 1 step of light (I did a shot w/o the converter at regular 1:1 with same subject and camera settings - I had to add 1.0 exposure in PP to the shot with the extension tube to reach the same exposure and histogram as the regular 1:1 shot.
Today I plan on taking a few more of these with other subjects (hopefully more interesting subjects) and will hopefully upload both the extension tube and regular shots together for comparison's sake.