There's a bunch of threads and posts on this. Here's my soluiton. After some PB Blaster or something similer soaking for a while, I found that if you place a heavy rag or towel over the hole and crank the engine a few seconds, the compression should blast the heat shield out. The rag stops it from shooting out like a bullet. A lot of folks will chime in and say what a horrible method this is. BUT, it works and I cannot see how in the world this causes a problem. Make sure the hole is cleaned out because you dont want any junk going down the hole....