I have come across this problem a few times, so far only on path lights. FX makes a few bi pin path lights where the socket is recessed and is really just large enough in diameter for the pins to go in. This is ok with a standard halogen bulb as the bulb base is just slightly wider than the pin displacement so it can go all the way in the small recessed area, but most LED replacements have a larger diameter at the base around the pin structure. Thus, it won't seat all the way down and generally pops back out. Just curious as to anyone else experience in this area and if they came across a solution without chunking the fixture and starting over.