design of the center casing reduces the number of assembly and disassembly processes needed and makes the turbine easier to install also as we have discussed bosses 6 of arm like lever 1 engage in oblong holes 03 of link plate 3 which is set at a fixed angle with respect to a radial line passing through the turbine shaft the reacting force on the actuator 7 caused by the gas pressure which depends on the nozzle vanes 2 and the frictional force experienced by the various components of the nozzle adjustment mechanism 100 can be reduced without increasing the arm length of the lever 1 as has been discussed the axial dimension of nozzle adjustment mechanism 100 can easily be made to fit within the scroll 11 this allows the length of the axial dimension of the variable capacity turbine to be reduced so that the supercharger can easily be made more compact in the second preferred embodiment of this invention shown in fig4 lever 1 is provided at the gas outlet side of the disk shaped link plate one end of lever 1 is fixed to the nozzle vane 2 the other end which has a boss 6 on it protrudes toward the link plate 3 that is it protrudes inward toward link plate 3 this boss engages in oblong holes 03 in the link plate 3 in such a way that it can rotate and slide along their surface all other aspects of.