A pressure clip comprising a mounting block, a clamp block, a spacer disposed between said mounting block and said clamp block forming a channel therebetween, support means in the channel for supporting a heat sink, means for securing said clamp block and said spacer to said mounting block, a pressure arm disposed above said mounting block, a flexible joint for flexibly attaching said pressure arm to said mounting block, a pressure screw disposed between said pressure arm and said mounting block for applying pressure to said pressure arm, and a plunger projecting into the channel between said mounting block and said clamp block for transmitting pressure from said pressure arm.