I have a Andersen door. If you move the lever up, two bolts engage at the top and bottom. Moving the lever down disengages them. My lever is frozen in an up position and the levers will not disengage. It is the only practical way to let my dog out into the fence yard, so we have a real problem until we get it to let go. I have tried heating it with a hair dryer, pushing the bolts out of the way with a screwdriver (they move a bit, then stop) and taking the levers off, but nothing helps. The lock works normally. Any suggestions? There are no model numbers on it that I can see (of course I don't know what is written on the part I can't see. HELP!

I have a metal gate with a lock on it. It works well, but I'm tired of having an entire lock cut off and a new one welded on whenever I need to re-key. 1) Does anyone know what the type of lock in the picture is called? 2) Does anyone know of a type or brand that allows the cylinder to be replaced without cutting the lock off/re-welding?