How to repair bottom diaphragm connection of Eminent Technology LFT8 planar speakers

                            Another option:

https://www.amazon.com/gp/product/B00EPYCIGQ/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1

                            Perhaps, with even better conductivity (more silver):

https://www.amazon.com/MG-Chemicals-Conductive-Conductivity-8331D-14G/dp/B08K3TG5D9/ref=dp_fod_1?pd_...

        Although: if the original connections were soldered; that would be my first choice, for a repair.

         Desolder the six through-holes, move the contact strip a millimeter or two further up on the diaphragm, to ensure a good contact patch on the (voice coil) traces and resolder through the holes.

That's great information George and Rodman! I never heard of those products. You probably saved the OP a lot of trouble.

These are great ideas. Thank you!  I ordered a conductivity pen with silver ink which looks similar to the items shown above.  However, you will see in the pictures that there is tape covering up the trace printed on the diaphragm, so I think I  need to remove part of tape to expose the silver trace to allow the silver ink to connect to it. 
 
Also, there is no solder connecting the trace to the bottom of the screw posts on the terminal board.  It looks like the screw posts just manually touched the trace with no solder between them. So I will need multiple layers to build up the connection to touch the bottoms of the 6 screw posts. 
I emailed Bruce Thigpen and he said to replace the entire diaphragm at a cost of $250 per speaker. I would like to try repairing the connection first to see if this works.

Some good ideas, but nothing worked for me like a new diaphragm. The fact that it’s a midrange and has a relatively low crossover with a lot of vibration, the repair I made became intermittent again. Good luck and hope it works. Keep the volume as low as possible to reduce the severity of vibration until the glue has cured for a week.

By the way, nice loudspeaker! An overlooked little gem. Only a little more $ than the Maggie 1.7i, and imo quite a bit better.