I’m guilty as charged m’lud. Recently I’ve started using a little bit of black-lining on my models. It’s made up of Vallejo Black, Johnson’s Klear and a touch of water. I store it in an old Vallejo bottle and use the lid to dip my brush in. Problem is the bottle top is not the most stable and I’ve been propping it up in the corner of my tray. I had thought of getting some wood from my Father in Laws and drilling a hole in it. Tidying up my Boy’s room this afternoon, “Lightbulb!” There were some wooden blocks that I had to put away and in amongst them was a little red cube. It was a matter of moments to get the drill and make a small hole with a slightly chamfered edge. Just the right size and not too space consuming on the tray.