Craftsman & others use this exact style Tecumseh Carburetor
PART 2: http://youtu.be/3JW_T33fPzk
2 and 4 stroke engines
Most commonly found on Toro S-620, S-200 S-140 and craftsman edgers
Most Carbs are going to have the gasket touching the body of the carb and then the diaphragm. Carbs with an F stamped on them like this one will have the diaphragm touching the body and then the gasket.
If your needles were not set back to original or if they were played with you may need to redo the settings.
To start set them to:
L: turn it our 1 turn
H: turn out 1 1/4 turn
This is enough for the engine to run. Start and let run until it is warm. Turn the H out (ccw) until the engine stumbles. Then count the turn and turn it in until it stumbles. “IF” the difference between the two was 2 1/2 turns; turn the H out half the amount or 1 1/4 from that position.
For the Low side you need to manually hold the governor linkage-throttle to the idle position. Do the same as I described for the High side setting the needle half way between each stumble test.