I'm assuming the part you called "butterfly" is the yoke (#9 on the
diagram). Remove the yoke by turning it CW while pulling away and check the motor shaft threads for damages.
If the shaft threads are OK, replace the yoke.
If the shaft threads are damaged, replace the auger motor.
- The yoke
Part number: AP4072309 
- The auger motor assembly
Part number: AP4009036 
Here are the breakdown diagrams and
Replacement parts for MAYTAG MSD2757AEB Ref - SXS/I&W | AppliancePartsPros.com
Gene.