If you find this in a search....
For fellow cab owners that run into this problem (i.e mirror not clipping on tight to the button & falling off/vibrating) try this;
Use Loctite rear view mirror glue to stick silver button onto (non-cab-specific) windscreen, then use pliers/long flat screwdriver to widen/contract mirror spring-mounted arms within mirror so it clips loosely onto button (doesn't fall off when u don't fiddle with it), then remove, coat mirror arm in CHEMICAL METAL (available in Halfords -devilishly strong stuff), re-clip on (quickly) - hold it for 30seconds or so, go have a cuppa tea and revisit in a few hours. Drive it the next day with a stable non-wobbly OEM mirror which can be tilted to your hearts content with the top down this summer.
