Having trouble finding the right drip tip for me. I never used them before so I had to order them. I always used a whistle or flat tip cart. I can't seem to find any anywhere in non metal. I can't use metal as I'm out a lot and it gets very cold. Also, was hoping for a smaller opening as I won't be actually dripping with them. I did order some twisted drip tips from nhaler but they are too tight. I called the company and they said to use vaseline which got it on the 510 atty but when I tried to get it off, it broke. Now I'm disgusted so any help or suggestions out there? Someone needs to make a flat tip with a small hole for us reo folks. Thanks for all help.