I tried the oven method on my Gen 1. I preped the unit by taking off all of the adjusters, level and the little plug on the bottom. Then I drilled out the six spots where the snap fit should have been. Then I tried 300 preheat then 20 min. with no success. So next I upped the temp to 400 for 20 min. All that happened is my lens turned a little yellow. Hopefully I can buff that out when I do get them apart. By which I will probably cut with a Dremil. Not quite sure what happened and why it didn't work. Glue was too old or what. But I decided to stop before I melted them completely. Is this the only two ways to get these apart?