Great tip and thanks for sharing. I use the same size bottle and have found that the lid from a Heinz squeeze bottle of ketchup will thread onto the head cement bottle and all I do is flip up the cap and insert my bodkin into the hole already there in the cap. Then just flip the cap closed when finished. If the head cement bottle is knocked over, there is very little, if any, spill before I set it back up. This also enables me to open and close the head cement with one hand.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.