Hi,
The metal bridge is wrapped in a mesh, that mesh is the same around the coil, however the metalic bridge is solid so the liquid can't go
through which confuses me.
Until I noticed that I believed that the bridge allowed the liquid to go on the
threads below it and those theads wicked the liquid all the way to the coil.
From wath I can see this doesn't seems to be the case, looks like the bridge just pushes the polyfill (or whatever you are using) so it surrounds the bridge squeezing some
juice that is trapped by the side of thw theads below it and into the coil.
If you removed the mesh on top of the bridge then there's less space between your cart filler and the threads below the bridge which may explain why it is working better. More liquid is delivered to the coil...
Just my 2 cents, I'm not an expert so don't take me seriously...