Saw the filter from one of these & thought of this thread
As a retired painter I have access to some of these new disposable paint mixing containers & think they would make ideal mini kief sifters
So hit up your local autobody shop or supplier & see if you can pick one up for free try asking for a test sample @ the suppliers
The blue ring snaps into the bottom of the lid
I would have to grind down the lip on the blue filter ring to be able to insert into metal ring of mason jar
& then solder the two mason jar lids together.
you could also just glue some fine mesh screen between the two mason jar rings
Think I'll give it a try on some of my already sifted kief & see if it makes it better