There should be a little button on the 65 and 66's that you have to push to release the cylinder. My button was frozen and had to be "coaxed" out and I ruined the lock cylinder. You may also have to rotate the key in the cylinder but not 100% sure on that one
I see that button and It wouldn't budge with normal human force, and I tried a few light taps with a punch to no avail. I tried both of these in many key positions. At that point I figured I was doing something wrong and decided to ask! The housing is crap I want to replace it but the cylinder is still good.