As a result, the clevis will not swivel; it is jammed.  This problem was found on both levers.

Obviously, that clevis needs to be carefully squeezed back to its original shape -- whereupon it immediately starts swivelling like it should.  But trying to prevent the problem from recurring may be more difficult.  Palm's solution is to install the cable differently; rather than install it the easy way with the slot facing outward, he turned the clevis around the other way so the slot faced inward.  This makes attaching the cable quite a bit more difficult, since the tip of the cable must be inserted between the clevis and the arm itself on both arms, and the rubber boot must be pushed through one of them.  Also, the retraction springs cannot be in place; they must be installed after connecting the cable.

The tip of the cable can actually be slightly trimmed to make it fit through this opening easier.  Grind three flats on the widest part of the tip in a triangular pattern.  The flats don't need to be very big to make the tip slip right through the levers.

The rubber boot can be greased a little to make it slide through more easily.  It is recommended to use a lubricant that won't attack rubber, like K-Y Jelly.

When done, the completed installation looks like this on the driver's side:

In theory, this method of installation should make the clevis slightly stronger, since to spread the sides would have to push against the stronger part of the arm.