Smeg A1.1K - Manual (Page 35)

Instructions for the user
69
11.3 Oven door seal
To permit thorough cleaning of the oven, the seal
may be removed. Before removing the seal, take off
the door as described above. Once the door has
been taken off, lift the tabs at the corners as shown
in the figure.
11.4 Lubrication of gas taps
With time it may happen that the gas taps get blocked and hard to turn.
Clean them inside and re-grease them. This operation must be done
by a specialised technician.