Smeg PX 140 A Instruction Manual page 18

Make sure that the pan stands are simply fitted over their burners, and are not
left in a raised or tilted position; if this occurs, repeat the fitting procedure.
After performing the operations described above (for each pan stand), the hob will be
as shown below, with the feet of the pan stands forming a pattern of horizontal and
vertical lines.
If a pan wobbles noticeably, check that the pan stands have not been fitted
incorrectly.
18
Instructions for the User
WRONG
WRONG
RIGHT
RIGHT