Ban306, thanks for the tips. on the rover I have always found the adjustment screws somewhat difficult for the back carb very little room. in that they are a double nut to loosen off, some that just have the spring to apply tension easier, but one has to realise over the years they can become rounded and the threads worn. looking at my carbs yesterday I will have to take off the filter bracket because the mounting studs for the air filter are in the way, but it is only four bolts.
Clive