Wormery question-how do you actually harvest the compost?

[Edith]

I have four of those Wiggly Wigglers things. (I know not everyone likes them but they are cheap from our council, and so far have been totally problem free)

They have been busy over the winter and are now all around half dark soil.

(I don't need the soil now at all, and can wait for as long as need be, though my guess would be that at this rate they will need emptying certainly by August)

So my question is, purely practically, how do you actually get to the soil without losing your worms?

[ugley_matt]

I'd leave about a quarter in the bottom, sieve the rest, put the worms that i found back in the wormery.