Oil gallery tapping without disassembly

[VX BlackRat]

Hi,
Need to use a larger fitting onto an oil gallery for an accusump. Is it possible to tap without having to disassemble the engine, I.e is there a method of capturing all the swarf?
Cheers

[VX BlackRat]

Its a GM 4cy ecotec engine, alloy block.
Planning to put the new oil fitting along the main galley that runs longitudinally. There are some m12 plugs along this gallery and I want to increase 1 of them to 3/8 unf.
I’m hoping I can drill and tap for larger fitting then hoover swarf out?

What’s a sandwich plate?

[VX BlackRat]

Sorry brain fade 3/8 NPT pipe size not UNF

[VX BlackRat]

Just checked out the filter sandwich idea and found the perfect solution, this was just the kind of lateral thinking that I needed. Many thanks!