Note: semi-flexible gutter sealant might be better than silicone
Apply a liberal ring of silicone sealer around hole
Place washer around hole
Push down
Insert short length of skewer into one end of the tee (the one to go through saucer)
Place a dob of silicone on either side of the tee (in the indent)
Carefully push and turn the tee through the hole until it sits flush with the washer
Turn 180 degrees
Smooth off silicone with a wet finger
Turn back
Smooth off the other side
Repeat for other hole
Orient the tees parallel, facing in to give easy access for tubing
Allow to dry
Turn over so you can see the unglazed side (top of saucer)
Apply a liberal ring of silicone sealer around the end of the tee
Place washer over the tee
Push down
Smooth off silicone with a wet finger
Allow to dry
Remove the skewers