[Gaz64]

A pic is a little difficult at the moment, but if you have a pin vice, you have two options.

Some bowls have a blind hole cast next to the outer edge of the umbrella.

A number 80 drill through there, or anywhere between the outer edge and the return spring seat will work.
The orifice allows any percolation to vent back to the bowl, and not pressurise the circuit after shutdown.

Gary