setzy, do you have the needle for that carburetor? I see the slide and screw-on top but can't see if the needle is there.
That drum has rusted away to nothing, it hasn't been broken. It may be possible to have an iron foundry use it as a pattern and cast another drum from it - I think it is pretty well beyond repair as a usable drum. Alternatively you might find another drum the same outside diameter and weld part of one drum to part of the other.
The clutch looks like cast iron in the picture. It seems to need the same cure as the drum - take it to a foundry and get them to use it for a pattern - but in the case of the clutch there is an alternative of machining a new one out of a solid bar of the same diameter.
That mower is way beyond economic repair based on its collector value. It is certainly repairable - vintage and veteran car enthusiasts do much more difficult repairs - but the item they are trying to restore is very much more valuable. I think you would need to budget in the $1,000 plus range to get it back into collectable shape, based on the bits of it I can see.
