I should have read the second post more closely, as it definitely puts a
different spin ar, ar on things.

My initial reaction is that there's no point to an interlock, as the
auto-shutoff switch automatically serves that function -- without a tape in
the compartment, the supply hub won't turn and the machine will shut off
after a few seconds.

I would start by figuring out why the lid won't close fully, and solve
/that/ problem first. It might automatically solve the other. A careful
visual inspection of the guts might be all you need.