Help with gas tube?

[45r]

I get a little bit larger drill and make few twist in the hole by hand.

I use an india stone to bevel the pin also.

Put the GB in a vise so it doesn't move around and tap pin in using needle nose pliers.

It goes in easy.

Finish with a punch once the pin gets close to edge.

I put a dot on tube to see if it's rotating while the pin is being tapped in.

If it rotates the pin will hang up and possibly damage the tube.