Success with earshell and smaller otoscope
Attached shows drilled out Ear shell to fit the 4mm otoscope & below is a picture of the drum showing that the otoscope is directed in the correct position (although the camera was upside down!):
Although shows proof of concept it’s not currently stable in the ear as the wire is too inflexible and moves the shell out of position
I’ll try with a longer silicon ear tip as this may secure it better and protect the end of the otoscope .