Any chance of a photo? I'm not familiar with a "Super 380".
OOPS -- "Super 280", I mean.
Here y'go.
This shows why I am calling it a "Super 280" even though I can't find a reference to it on the internet:
The next two show why I think the A/V is disabled; note the space where the bolt pulls the handle tight to the chassis, and the empty hole where the bushing would go:
Overview of the shape of the thing:
Muffler:
That's pretty much all I know about this thing so far.