Got to thinking about the T wrench. I pulled a plug out of the '32 engine and compared it to the wrench. It does not fit inside either by length or socket size. C.C.M. is rather crudely stamped in 5 different places begging the question was this perhaps the initials of the original owner? My Grandfather was a pipefitter during WWll at the Bremerton shipyard then later at Hanford Nuclear site, retiring in the '70's. Was this perhaps a special wrench used in industrial pipe fitting that he somehow ended up with? This tool has been there for as long as I can remember and I was born in '58. I don't ever remember my Dad using it. The mystery remains.....