Have run another few tanks through. Cut off 10mm of the catcher lip, which helped with the clog
In its latest outing, ran for 1 hour and mulched an equivalent of a 240l council bin down to a few catchers of mulch.
Happily chip green wood up to 25mm, and dry wood up to about 18 without protest. Will self feed itself with reasonably straight camellia branches full of leaves.
Did stall it twice when I had some very damp peppermint tree I tried - clogged the chute and then went down all at once and bogged it down.
Then went to pull start it and I pulled the entire cowl off in my hands - all the (previously tight) bolts had vibrated loose from all the repetitive high loads.
The only thing I need to look at is it blows back up the chipper chute a bit. A rubber deflector may be in order
But it makes good mulch and saves a lot of space in the bin