Have you searched "anatomy of a mortise lock" using images? I've just looked but several come up, but none similar to yours, as above, the make would be handy
Oddly enough before reading this post, I thought, hmm he usually responds to my posts, even if nobody else does. Hoping he is ok. We haven't heard from some in the CC either.
You can still do it, just yours is round as opposed to the hexagonal types. Be careful, use water pump pliers or similar to back it off. Maybe clean the brass on the spindle using a cleaning strip.
I work I social housing and the amount of times I’ve seen similar is frightening. Customers who have inadvertently knocked their boiler fcu switch off and these are in plain sight, but still call us out for no heating or hot water. At least yours was hidden to be accidentally knocked.
I do normally have a look and usually make sure it’s tight too. We have an option to pass it on if it’s not visible, I just wanted to know if the test I’m doing is ok. Vast majority of our properties have the connection where needed. However, some of our sparks aren’t arsed about it being after...
I attended a job the other day and couldn’t visually see the main bonding connection and tbh didn’t have the time to pull the washing machine out and check. Is there a way to test if there’s a connection, or does it need to be visually inspected?
Aside: I sometimes have to connect the bonding...
They’re usually ok to work on hot water as they circulate around the plate heat exchanger same as using it in summer mode. Your mates must have been something different. They usually have sensors/ntcs to prevent overheating