If you're serious about making hash from your trim and small buds too small to bother trimming, you need one of these sieves in 120 micron. Its well worth the investment, and you can probably find it near you in a pottery supply store.
Before I run mine through the sieve, I process it twice through a large strainer into a pot, and collect the powder there first before I even process through the sieve. You will see the powder as soon as you dump the material into another container for reprocessing. Use a small paint brush to pile it up to put into a storage container, pollen press or bowl.
Then use the sieve on a mirror or other glossy type mat and collect the powder with a card. You'll get the knack as you give it a go!!!
Laguna Steel Lab Sieve