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  1. A

    What bit do i need to do this?

    I'm an aeromodeller and have a small lathe. I've made some venturis like the one in the photo. The hole on the side of the venturi is threaded 4mm fine pitch. What I need is a bit that will create a round flat recess around the 4mm hole so that the needle valve assembly will seat properly and...
  2. A

    What do I need to do this?

    Hi all. I'm an aeromodeller and have a small lathe. I've made some venturis like the one in the photo. The hole on the side of the venturi is threaded 4mm fine pitch. What I need is a bit that will create a round flat recess around the 4mm hole so that the needle valve assembly will seat...
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