New disk in the gear between the gearwheels suitably with MZ TS250 / 1 and ETZ250, ETZ251. One needs this stop disk 4x. She sits between switch wheel 4./5. Speed and impeller 5th speed, impeller 5th speed and bearing in 6203, switch wheel 1./3. Speed and gearwheel 1st speed, gearwheel 1st speed and ball bearing in 6203.