Troy Bilt won't start after turning on it's side

I have a Troy Bilt model #11A-436M011, a push type purchased at Lowes about 3 years ago. Last year I hit a rock in the lawn, and while removing the blade, turned it on it's side to inspect the damage. It no longer started. I learned I had probably upset the float preventing it from starting. I had it professionally repaired, then managed to hit another rock this summer and damage the blade again. I thought I was careful to tilt the lawnmower carburetor side up this time, but apparently I did something wrong as it will not start again. I'm trying to find guidance or instructions, links to diagrams, on how to at least rule the float out as the culprit or suggestions for other troubleshooting, as another professional repair on this machine will have me exceeding the mowers initial cost. Before I give up and buy a new one I'd like to try to repair it myself. I am not a mechanic so what may seem obvious to some may not be to me, so if offering information please keep that in mind.