I have been running one of these all year, It works really well. use a glove or rag to take off the cap, problem solved. (also as a bonus it burns dumbasses that have no business touching your stuff;-) I have not had any dipstick blowouts since I installed this and my catchcan has more in it than I had expected it to. I bought a bunch of these from Hal, he is a great guy and makes some cool stuff. Also, it takes 3 times longer to read the intructions than it does to actually put the things together.
It is a really good product made by a nice and smart guy.