Well as long as I have been around Cubs another 1st happened. While removing a spark plug for a compression check the spark plug insert backed out with the spark plug. The spark plug is seezed in the insert & I have them both soaking in Kyroil now (I will separate the two later). Does anyone have experience installing these inserts? My thoughts at this time are to chill the insert in dry ice, & install with Locktite, let sit for some time then remove the plug I installed it with.