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Drilled hole to bypass the check ball:
Signal amplifier tube:
To install, you remove the lead plug, being that it's soft, it's easy to catch with a drill bit.
The passage should be about .120, so I drill an entrance into it at .128, the middle section I drill to .125, and the last little bit I leave.
This is ever so smaller than 1/8 brass tubing so it'll be hard to knock in, but it isn't going anywhere.
The brass tube is 1/8. I cut it about 3/4 inch and file the end for the 45degree end.
Hammer it in with a small punch, making sure it's aligned correctly.
Make sure the VS passage is fully clear to the secondaries, as once they crack open they help pull the VS's open.
When done, I drill and tap the entrances at 8-32 and plug with a set screw.
Best to use a marker on a small drill bit to gauge depth when doing any of this.
FLikr isn't working right, so I pulled these pictures from my fb page, hope they work.