I just recently started using a Billet Bridge, so I'm not TOO familiar with them, but based on looking over the DIY Billet Bridge instructions I may have an idea for replacing the bottom trim piece of a real-deal Billet Bridge.
What I'm thinking is that if you have a spare 510 extender and a Dremel tool or something else to cut/grind with, you should be able to cut off the bottom/threaded part of the extender to make what is basically a 510-threaded ring, that should be able to replace the bottom part of the Billet Bridge (and would be open enough that the pin of the BVC atomizer can be left as-is).
Might be something that'd work in a pinch, anyway....
If you don't have any tools you can just exchange pins and it works perfectly. If you decide to cut it there is a little inside ledge that you need to get rid of. The other thing is the additional little ring on a longer extension works if you have newish o-rings, there is a flat bit that will leak slightly if your o-rings are a bit old.
it fits perfectly and the tiny orings in the coil head make a good seal in the extension bit. Glad the instructions helped
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S'nort!