Q I’m just about to take my Mini to uni, and have managed to damage it by performing a simple oil change! Basically, I over-tightened the drain bolt at the bottom of the gearbox. It seems to have stripped the thread and I can’t tighten it up now. Will I need a new gearbox or is there a cheaper solution? Alex A Some Mini specialists sell a replacement plug with a self-cutting taper thread on it that will screw in to the damaged thread area without the need to remove the engine/’box from the car. It’s a bit Heath Robinson, but gets folks out of a scrape until the thread can be properly repaired using a Heli-coil, or other thread replacement insert. Mini Spares (www.minispares.com) sells it under part number DP2. It must be fitted by using it as an engineering tap – half a turn in and half a turn out again so it cuts its own thread. Don’t overtighten this one as it could crack the alloy casing!
“Way too many folks fit these replacement filters then try to correct the fuelling by simply adjusting the jet”