Ive not described it very well so... I either need to fit my arctrave whole (full 70mm width) and notch out the coving (which I think will look awful) or, as I am intending, 'rip' the architrave top section (if I am picking up JobAndKnock's terminology accurately) such that it is narrower. If...
Due to a door archtrave running really close to the coving above it, I have to do something odd with the architrave top span. I am toying with cutting it much narrower (20mm) than the uprights (which are about 95mm). My head is telling me to just to a mitre joint to suit this disparity (though...