Here is a machined aluminium triangle/mystery wedge for your macrobinoculars. It can be screwed to your transition box from the inside using 2 included M3 screws and the Eumig button can simply be glued to the turned aluminium cylinder attached on top :-)
Included: machined aluminium triangle with turned button support, 2 M3 hex screws and paper drilling template.
Eumig button, transition box and Kalimar hood seen in last picture are not included. The transition box used in the example is from Portumac props.