This a must have tool set for avionics and radio technicians. It has the potential to pay for itself on those jobs that you would otherwise spend half a day pulling the panel just to tighten the jack.
The Jack Hack includes two expanding post tools: one for standard 0.25 (¼ inch) diameter jack used for stereo GA headphones and one for the smaller (0.205 inch) jack used for the PTT connection.
