An implantable receptacle for receiving a hearing aid component includes a body having a proximal portion, a distal cylindrical portion and a joining portion joining the proximal portion to the distal cylindrical portion. First flexible tines extending from an outer wall of the distal cylindrical portion in the general direction of the proximal portion are configured to engage with and lock the distal cylindrical portion to a wall of a fenestration in a bone of the patient in a permanent fashion in response to pressing the sleeve into the fenestration. Second flexible tines extending from an outer wall of the distal cylindrical portion in a direction generally tangential to the circumference of the distal cylindrical portion are configured to engage with and prevent rotation of the distal cylindrical portion within the wall of the fenestration.