Hello there Setsuna Stratos
Good to see you back around again
sorry I din't get back to you sooner but I was looking
through the archives of when you bought your chassis so knew which version you have.
I believe I found your order in 2011
Okay so on to getting your LED re-secured...
You said your chamber is built so, you should be able to unscrew the 4 aluminum posts on top of the
power gates along the sides and be able to lift your top crystal and power gates out and one unit.
This will allow access to the bottom plate so you can unscrew it and get back in to the LED under
the bottom crystal.
If the LED is not sticking to the single layer of thin DS tape you can add another layer or two
to provide some cushion for the LED to sink into and grip better.
Alternatively you can use the thicker DS tape but you will need to test fit to make sure the face
of the LED isn't touching the bottom of the crystal so you'll want to maintain a small gap.
I would also recommend adding some DS tape under the wire leads in the channel on the mounting disk
that they run through to help keep them in place as they do get tugged on a bit when routing them
up through the power gates and on to the board mounting area.
Please let me know if that helps and Good luck with the rest of your build