>Anybody have a clue about HM Co.?
The H is a K
Kent Moore co.
The tools is in my catalog, fits the Standard transmission, 39 Buick, 1939-1950(+?) Olds, and all the Pontiac transmissions with Syncros....
In 1950 it would have set you back a pretty $2.75
Unusually large amount of text for a KM tool, generally you are lucky if you can find a number..