The only reason I know of why we have the round one is because the police/medical choppers use them IIRC. Also, if it was easier to clamp down the single point in the first place I'd agree! Great find. More valuable information Good question. If I can scare up a flashlight of each, I'll test it So basically, I have these tests lined up. 1. Paper towel evaporation test (adding sticky notes too, out of my own curiosity). 2. Extended contaminated fuel settling test (so far, sources say it won't ever separate out but in the name of experimentation I'll give it a shot). 3. Testing with sunlight behind and shadow in front (possibly in front of white/cream color). Any other requests? Once it gets slower here I'll give it a try. Overcast layer at 1700 today so probably no joy on the sunlight from behind test just yet.