I found it odd that the only mention of this adjustment I could find in the manual(s) is where they say to mark the cable adjustment in the manual transmission removal procedure.
(I had to steal some pics ;-) From memory:
The cables may be out of adjustment if it has been removed (for trans/clutch removal, cleanup, etc.). The cable sheath ends at the handle should be seated fully into the bracket. (See yellow arrows below. 1st pic, they are loose). If they or the actual cable gets too loose, the actual cable's end will fall out of the 'swivel' (see red circle below), a PITA to put back! -- You will need a helper.
First make sure the cables are routed correctly and
all cable clips/grommets/fasteners are installed and tight. Remove the cotter pin and adjust some slack in the Adjustment Bolt (#37). Loosen the 2 nuts at the caliper end of each cable (4 nuts total, see blue circles below). Each pair of nuts jamb each other holding the cable to its bracket. Someone needs to watch the handle end to make sure the actual cable ends don't fall out, the sheath ends remain seated in the bracket and tell the other person how the swivel alignment looks. Meanwhile, the other person adjusts the nuts until the sheath ends are seated tight and the swivel is perpendicular WRT its halves AND the two cables, by walking one set of nuts in and the other out. (See red in pics below).
"Fine tune" per previous posts then re-check swivel alignment when park brake is applied.
Again, don't let the cable ends fall out -- You may find it easier to disconnect the entire assembly at the handle end from the body to begin with...
loose.jpg
AN.jpg
SW-P2.jpg
Dgm.jpg
Let me know if something is not clear or...??
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P.S. Don't expect a lot out of the P-Brakes...I've seen several with the swivel bent.