Motor Coupler is the small circular part with teeth that sits on top of the Motor, the mixer Jar is placed on this Motor Coupler in such a way that the Jar coupler teeth mesh with the Motor Coupler teeth. The part is easy to replace.
Preethi 1.25L Chutney Jar for Eco Plus/Chef Pro and Blue Leaf
Preethi 1.55L Jar for Eco Plus/ Blue Leaf, 1.75-Liter, Large
VIDIEM 0.5 LITER MIXER JAR (CHUTNEY JAR)
Preethi Mixer Grinder Blade - Type 2
Preethi Coupler Mixer/Grinder Motor