Fixing the front door lock

I like taking apart mechanical things, especially those with chunky fixings. When the catch on our front door stopped working properly, after being allowed to slam shut in the wind a few times, it needed investigating. 

OK, it needed replacing with an identical one, but after that I took the old unit and had a play. 

The basic device is simple enough, there's a bit that turns which shoves a cage back and forth, on to which is fitted the brass tongue bit that locates in the other side of the unit to hold the door shut. Obviously, I've not looked up the correct technical terms...

The fault was that every so often, the handle inside the door seemed to lose contact with the slidy cage and flop around. My first thought was that the cage could move out and miss contact, but there didn't seem to be a problem there - no obvious wear in the plates holding the thing together, and the two, chunky retaining screws were tightly fitted.

Eventually, after about half an hours tinkering, I spotted the cage was slightly distorted. Slamming the door on the latched unit had whacked the tongue and moved the metal. Five minutes with pliers (it's quite soft) and a hammer and the whole thing moves silky smoothly. As good as new. 

Now, we have a spare front door lock all parcelled up in the garage, where it will probably manage to vanish if we ever need it. 

Anyone else like this sort of job?