hey guys , i went to check the fluid levels on my 97 250 4x4 zf5, the filler plug is striped out, the 3/8 ext. just spins inside the plug. i borrowed a set of screw extractors and drove the 1/2 one in as far as it would go, put a socket on it and when i put some pretty good pressure on it , the extractor just comes off.can the transmission case be damaged by hitting the plug area too hard? seems to me that i could drive the extractor in a little more but im afraid of breaking the case. i am thinking of putting a bolt on the plug and spot welding, has anyone tried this? sorry for the long post, any help would be greatly appreciated.