Now that I am on Xmas break, I have some time to putz around. I searched the Borrego from front to back and bottom to top, no tubular key for the lock pin.
As usual, my father-in-law had the tool to take care of the job. It was too tight of a fit for the hand held Dremel rotary saw. But, Jim's reciprocating saw cut through the locking pin in less than 30 seconds. Almost, like butter!
Now on to the brake controller (see other thread).
Thanks for the feedback to just cut off the locking pin as the easiest solution to my problem. DONE!