Younger daughter and partner have managed to break the locking buttons on the carrying handle of their MaxiCosi Pebble car seat.
Dismantling reveals the mechanism to be the moulded button itself and a coil spring that holds it in one of three possible positions. The part that bears against the spring has broken off on both buttons.
Replacing the buttons is a simple task and they can only fit one way round as they are handed.
MaxiCosi refuses to provide me with the parts as the repair is listed in their manual as a safety-related issue. The rationale is that if it is done incorrectly the seat (and contents) could be dropped. As it is out of warranty (bought second hand) the seat has to be returned to them at a charge of GBP 39.99, including carriage. It might be possible to get e.g. Halfords to do it, but I don't suppose that would be cheap either.
Bugger.