Wow that’s kinda terrible. I didn’t expect that. But thanks for trying it out!
Hmm, I would be tempted to eschew the T5577 if 4 LEDs and a center hole were feasible, but it doesn’t look like it. Just not enough real estate on that guy.
I’ll just go with 2 LEDs and the T5577 then. Without a center hole, I won’t do without a backup chip it the other goes tits up this time 
Any chance you can line up the LEDs along the diameter line?
Out of curiosity, with the 4 LEDs inside the larger coil, did you notice any performance drop?
Finally, I’m still debating whether I want to ask you to make it elliptical (41mm major axis, 33mm minor axis) with the LED along the major axis. Aesthetically I do, but I’m concerned that, if for any reason, the chip or some other part of the implant ends up inconveniently placed with regards to one of my fleshy bits, it won’t be able to spin to settle someplace else.
Incidentally, I don’t know if you’ve already sent our the coupons, but I didn’t get anything. If you haven’t, disregard this. I’m just asking so I can place the order.