HELP! Toro 721 R — missing carbeurator part

[Baltimore whiteout]

Hi guys,

Tried to get my Toro Power Clear 721 R up and running after several years in the shed. I put some gas in it and it came right out the bottom. I see a bolt missing, what looks to be an adjustment bolt(?) on the carbeurator. I don't know how I lost it, I'm pretty sure I wouldn't have just taken it off and left it.

The threads don't match the other bolt there. I'd really like to just replace the bolt, not have to purchase the whole carbeurator assembly. Can anybody help me figure out what this (probably) flanged bolt's specs are?

 

[Baltimore whiteout]

 

[EFSM]

M6x1.00 threads. The big one on the bottom is 8mm IIRC.

 

[Coupe]

Carbie drain plug to empty bowl.

 

[hacskaroly]

I don't know how I lost it, I'm pretty sure I wouldn't have just taken it off and left it.

It's always possible that it was loose and vibrated out, kind of like a bar nut on a chainsaw.