We purchased a new Met Prem in Dec and were finally able to unbox / setup this past weekend.
During diagnostic testing the snake jaw fails to open and stutters the same as in the video found in this thread however it seems to be fine when playing the game (opens, closes, holds / ejects balls etc>.
This is our 1st Stern & unsure if there's an issue with the snake or the diagnostic testing utility? I'm not sure if sometimes the snake may fail during testing but operate fine during / after game play.
EDIT: No problem with the snake - with interlock in closed position it is fine. Great thread though for those wanting to make adjustments to their snake!