What is this on my air filter?

Ok, heres my guess.
When they introduced oxygenated fuels here, one of the first things I noticed was the tendency of the engine to require longer than normal crank times when not started for several days. I attributed it to the lighter portions of the fuel evaporating. So what I did was learned to prime the carb before each weekly start. I used a plastic bottle and just sloshed a few CCs down the throat. Worked like a charm.
No if a guy was more particular than me, he might be inclined to measure out an exact amount of fuel and inject it into the bowl through the vent tube. And if he wasnt dressed in coveralls, he might be looking for a holster for his injector.......
You see where Im going with that?
How long did it take?
Ok Ill spill the beans.
Its a syringe holster.
Iknow, I know. The hood might not close with it in there, but its all I could come up with.