Have you read the thread entitled, "3w100 dies, plane dies, vicious cycle? " I'm wondering if you've explored and read the reams of information on the warping of the phenolic carb spacer? This post is one of many that addresses that matter. I posted a couple of pictures of the DA spacers I recently aquired. I plan to retrofit them in the event that this problem crops up on my 3W 100 or 3W140 in the future. I've just not experienced this situation yet. Again, I am interested in your findings_bob