[ACademic]

Sometimes one of the tangs will hang up. You can spray some WD-40 down the lock cylinder opening where the key inserts. That might make its way to the tangs. Then just keep wiggling it and it should come off.

On another note, unless you live in a rough area, just ditch the locking cap and install a regular one. The locking caps are a bit of a PITA inside the Lemans cap and really not necessary. We are so used to needing them on our DD's but a Cobra doesn't, IMHO.