This invention relates to an apparatus for making highly stable and reliable contact, suitable for radio frequency circuit operation, with a component such as a varactor diode or Gunn diode. A prior art assembly which has been used to make contact with such diodes includes a mounting plate assembly and a threaded contact which can be screwed into position to bear against the diode and thus make electrical contact with it. One of the problems with this design is that the threaded contact can stress the diode, breaking it. Another problem is the potential loss of electrical contact with the diode due to thermal expansion and contraction.