Raj VU2ZAP made this 4 way female Dupont socket for mounting either the stock IRF510 or Mitsubishi parts such as the RD16HHF1 or RD15HHF1 in the finals circuit of his BITx40. You must first desolder and remove the stock IRF510. An extra hole is drilled in the circuit board to the left of the three existing holes for the stock IRF510 . The new pin hole to the left of the regular 3 holes is wired to the gate pin of the IRF510.
By reversing the RD16HHF1 orientation, and inserting in the left-most 3 pins of the socket, the device now substitutes for the IRF510. But you can re-insert the IRF510 at any time by unplugging the MOSFET.
Raj’s parting comment is that “you will need to think of a heat sink plate that fits this way!”