HI Jackman,
On a farmall H and M you have the GOV on the RH side of the front of the motor as looking from the front. There will be a cover that has about 6 or 8 small bolts on the side to get at the spring then there is a spot on the top where an aluminum tube come out of the gov linkage its about 8 to 10" long and the other end there are 2 screws that hold it to the top side of the carb. there also is a little tab there that a lot of people when they take carbs off do not get realinded and the tractor either speeds out of control or idles without moving up and RPM's. If this is not what you are looking at then you will have to ask someone that can see or get a pick somehow,
JON