I think he's referring to an actual whole Blu-Ray drive, he's wondering if he could swap the 8x diode in the drive and replace with a GGW in order to still have a functioning drive... Sorry if I'm mistaken though.
I have done this recently and it takes a little bit of adjustment/trial and error with the new diode.
If you are going to do this the LG 8x, you can do what I did. Just keep the heat sink in the sled and work on prying it out with a filed down flat head screw driver while pulling up on the case pin. I used a PHR diode to replace it and it reads discs just fine.
Truly a great idea, to still have a Blu-ray reader drive to use (NOT return as "defective") after harvesting your burning diode.
I remember when the first PHR diodes were found in those Toshiba drives that were really cheap, people would pull out the violet diode and still just use the driver for DVDs, but this takes it a whole step further.
I removed the ribbon cable with the solder blob method then proceeded to pry out the diode with sled/ribbon/heatsink in tact. After I removed the diode I just inserted the PHR into the empty slot and soldered it to the in tact ribbon cable. It didnt read blu-rays at first so had to open it back up and press it into the heatsink better which made it work.
It isnt easy to pry the diode out with the heatsink still in the sled. I had to use some force when pulling up on the case pin. Prying it alone will only loosen the diode.