Thanks for the update Ron, I had it in the back of my mind that I couldn't use liquid grease in the M20 box but couldn't recall why! Mark, it may be that I have a little too much oil in the box though in the thread 'Gearbox oil overserviced' Ians advice is to fill part way up the filler neck, half is I suppose part way but far from the 'Keep full' as written on the filler plug. Your adapted bush may well do the job. I'll have to take the end cover off and measure it .
Many thanks
