Use an oven to open them. Stick it in for a little over 5 minutes @ 250 on top of some cardboard. Take out with some gloves and pry for 30 seconds. Put them back in for 3 minutes. Pull them out and pry. Might take 2 or three times to get them open. Pry at the front tip.
To seal, use a heat gun. Heat up sections and push together. Heat up areas next to where the screws are and use the screws to pull the lens into the siliconed "grooves".
Be sure to use some black silicone after the fact to fill in all the space or they will leak.
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