These were not just a plug and go like they should be. I tried to put them in with no luck 1st, second and third time. I had to file the knobs on the side of the bulb because they didn't quite line up with my grooves they are supposed to twist into. Once I got the first one in, the second one was much easier, but still I had to file both knobs.
We are perplexed by your experience. We have sold hundreds of this bulb and have never heard of someone having that issue.