According to aspects of the present disclosure, an implantable electrical system may include an implantable pulse generator with a bore sized to receive an electrical lead, with an engagement mechanism that does not require the use of set screws to secure the lead within the bore. The engagement mechanism may include a deformable component that may be moved or deformed to allow entry of the lead into the bore, and then moved or deformed again to engage a surface of the lead to secure the lead within the bore. The engagement mechanism may allow rotation of the lead within the bore while maintaining electrical connections between the generator and the lead. The engagement mechanism may also allow the securing and/or release of the lead relative to the bore without the need to manipulate a set screw or breach a seal of the generator.
