It takes a while to get used to all the things that can unscrew. I accidentally unscrewed 28 the other day instead of 26 - makes a mess...
A screwdriver in an airhole is good for getting purchase. Many recommend removal of orings and lubing them with juice.
I've just added a chimney extension and glass to mine to take the capacity up to 6mm. Have quickly discovered that this adds another part that can be accidentally unscrewed.