During reassembly:

Remove any remaining adhesive residue from the frame and apply double-sided tape such as Tesa tape.

If you don't replace the adhesive, the vibration motor may shake loose and rattle during play.

Transfer any foam padding from your old motor to your replacement part.

Press the motor back into its recess and apply firm pressure for a minute to allow the adhesive to bond.

Solder the two wires to the new vibration motor.

Use the point of a spudger to carefully tuck the motor wires back into the groove.