Looking for Data I/O "calibration extender" 910-1521

After removing the PROMs from my RX02 controller and attempting to extract their contents, I've discovered that the Unipak for my Data I/O System 19 has a failure. It's returning Error 70 whenever socket 6 is accessed. Of course socket 6 is the one the 7643 PROMs need to go in. Error 70 means something's wrong with the "bit supply". Data I/O built a "calibration extender", P/N 910-1521 that was used to enable probing of the Unipak while it was raised up and out of the main chassis. It would sure make it easier to work on this thing if I had access to said extender. Does anyone have one they would be open to loaning out for a short while while I attempt repair of this unit? Or, better yet, does anyone have one they want to sell/trade? Chris St. Paul, MN USA -- Chris Elmquist