Page 13 from the CRACK Manual.
Nine Pin Socket
( ) Set the nine pin socket
into the nine pin socket
hole of the chassis,
through the top. Be sure
to orient the gap in the
circle of pins so that it
faces the volume
potentiometer. Place the
nine pin socket retaining
ring over the socket and
insert a 4-40 x 3/8†screw
through the rear
mounting hole.
( ) Hold the screw in the
hole while you flip the
chassis plate over, and slide a five lug terminal strip over the screw, oriented as shown in the photo.
Secure with a #4 nut. Slip another #4-40 x 1/4†screw through the front hole. Slip a #6 locknut on the
screw from the underside and secure with a #4 nut.
I did not used the stock socket so i can't comment any further.