I am in the process of tearing down a 350 chevy for a rebuild. While removing the old frost plugs, the driver's side rear plug fell into the water jacket. The plug fell toward the back of the block, and I can now barley see it. I have tried for about an hour to get a hold of it, and pull it out to no avail. I can't even get it to move, and it acts like its wedged back there. Are there any tricks on getting this thing out?