Most of the M5 rivnuts are now installed for the tailwheel mount, the left side required internal & external supplementary skins to support what became enlarged rivnut holes. Those skins were alodined & primed prior to installation. I need to replace/add rivnuts in the vertical stabiliser spar, but before I can do that, the lower edge of the spar will need to be trimmed as two of the new rivnuts won't allow the spar to sit in position. I will need to disassemble the stab, not looking forward to that.