I want to thank you for this thread! I had to do my LIM gaskets and saw this. I was able to locate end plugs. One thing I might of done different is I would of ground down the plug so I wouldn't have to tap so far to get it flush. The aluminum is thin there and its a fine line of getting the tap in just right! I believe I went about 13 1/2 turns on the first one so the second one I turned the tap in 12 turns and then slowly creeped it until I got the plug flush.