As a temporary fix, I filled the holes with chemical metal (more successfully than I had guessed

and repainted it all.

- RoverAirFilter.jpg (23.57 KiB) Viewed 1100 times
.
I read that in use it gets oil
vapour from the engine. But how should I first fill/inject it with some oil?
Would 'Duck Oil' from an aerosol can (with the thin pipe/nozzel) be any good?