I am a builder with 25 yrs of experience. I have had the misfortune to have to work with plugmold on many occasions. The stuff is just insanely hard to work with. I used to work with an older electrician who would almost walk off the job if I even mentioned plugmold. I have spent easily an hour trying to get the "cap" to snap on the outside of this crap and have resorted to using a big hammer more than once. I'm not stupid or unhandy, I am a master carpenter, this stuff is just poorly designed.