We have a Mira Atom bar thermostat shower, with both a hand-held shower-head and an overhead 'deluge' head. A diverter valve allows selection between one or the other, or both together. However the direction that the little bar on the diverter valve points is counter- intuitive: upwards for the hand-held head, to the back for the overhead deluge, and forwards for both together. I would like to reverse the first two, as they presently offend my sense of logic (but work perfectly OK, so it's a personal thing!), so that up diverts to the overhead and back diverts to the hand-held.
Removing the cap on the diverter valve assembly reveals a screw head, holding in a plastic fitting. Before I start taking it apart, am I likely to be able to change the flow settings in the valve by re-positioning this fitting in some way, or am I stuck with the existing arrangement, in which case there's no point in fiddling with it? (The Mira web site doesn't show an exploded diagram of the diverter, although it shows exploded diagrams for almost everything else).