Here's what Scary Jerry's instructions that I followed to a tee and worked like a charm!
Place your headlight in the oven at 175, but no more than 200 degrees for 8 minutes. Check it for softness (the bonded bead). If not soft and pliable, go another 8 minutes. No more than 15 minutes at 200 degrees is the main point here...
CAUTION - Wear gloves as it will be hot!
Use 2 flat tipped screwdrivers and start prying apart...
Do what ever you intend to do inside the headlight...
(FYI - don't install Angle Eyes - they are fragile and break real easy...)
ADVISE - Don't get your greasy fingers on the inside of the lenses - wear cotton gloves.
When completed - Set the 2 halves together and bake as before. After 8-10 minutes, pull out and Press together. Bake again for no more than 5 minutes to complete the seal.