Abstract: Apparatus and methods are provided for aligning a bone-penetration device with a nail-hole at a distal end of an implantable nail. A lateral x-ray image of a drill-guide and the distal end of the nail is generated by: orienting an x-ray source with respect to the drill-guide, using a coupling device; and generating a lateral x-ray image of the drill-guide and the distal end of the nail, while the x-ray source is oriented with respect to the drill-guide. It is determined that the drill-guide is aligned with the nail-hole by determining that, in the image: (a) a line corresponding to a longitudinal axis of the drill-guide, and (b) a line corresponding to a longitudinal axis of the distal end of the nail are substantially collinear. In response thereto, the bone-penetration device is aligned using the drill-guide.