One of the stunt pages in the A M A mag, spoke of drilling both outlet & through, 1.5 m.m. Dia. Passing bit by finger severally along axis to deburr .
Says it neddles better in the ST 46 .
I have had the little O S NVAs in G-15s , you unwind the neddle till it falls out, and theyre still to lean . Had someother do this too, centuries ago .