........First mini frustration was removing the over riders from the fixings. Having established the right sized socket, I then found there wasn’t enough room for my ratchet lever to fit, so back to the tool box and used a suitable open ended spanner.
However they are still fixed at the bottom by a cross head screw. After much faffing around I found the right sized screwdriver head and then found the screwdriver handle was not working, a ratchet style handle that now seems to only want to screw things in and will just spin in the “lock” or “undo” position. More ferreting around found a suitable substitute handle and the over riders came off.
Those lower rear overrider screws are described as socket button M6 x 20 in the parts manual. It seems in recent years MMC have been fitting cross head screws though, requiring very short screwdriver, so poor purchase. When I finally got mine off I replaced with stainless socket button screws allowing simple removal with allen key.
