On my Halifax I used a jewlers screwdriver pushed under the end of the retention spring to lift it. Safety can then be slid right out & same procedure used for replacement. I tried turning it to the other side, even made a couple of totally new safeties putting the lever in various positions & found nothing to my liking at all. A fabulous little 16ga @ 5lb 14oz "BUT" I hate that safety with a passion.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra