Hi. We have tumbler, hot bin and 2 wormeries we have overwintered and ready to sieve and use. We have and electric rotary sieve but im worried it will harm the worms. When we did it manually I picked them out.
Check Amazon. Large rotating barrel with 10mm or 20mm mesh, sits at an angle. You shovel soil in one end, it rolls round, small stuff sieves out and large stuff vibrates down to the end and falls out. Separates stones etc.
I never bother sieving. It's a PITA. I throw out bigger pieces of twig and put smaller bits, pits, cobs etc back into the compost for another round. Run it through your hands and you get a sense of bits that need to go back in.
You only need a portion to survive because they breed so quickly, so would suggest you hand-pick a jar full and put the rest through the sieve. Any which don't survive will just become part of the composting process.
A trowel in the hand is worth a thousand lost under a bush.
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I'm intrigued as to what an electric rotary sieve is.
Try a small batch to see if they survive intact
How do stones get into your compost bins / wormeries?
Sieving seems a lot of faff IMHO
Mulching, virtually anyone goes, mixing for potting needs to be finer.