Quoted from rkahr:
What temp? How long? placed on wax paper, I assume. My long plastic on the left side (surrounding the ball lock) in particular is shaped like a mogul field on an expert ski slope
Haha yeah mine was pretty bad too, probably about the same as yours described.
Put the plastics on a wax paper covered baking sheet. You want a flat baking sheet, don't just put them on the wire rack in the oven, or put them on a sheet where the plastic overlaps a lipped edge. Set the baking sheet in the oven, center rack. Now set the oven to 200°F. As the oven heats up, the plastics will also heat up and start to "melt" back down flat. You have to sit there and watch them, do not leave your oven. There isn't really a set time, you just have to watch them. Literally grab a chair and sit there and watch them the whole time. You will start to see the plastics flatten back down. The instant they are flattened, remove them and let them cool, keeping them on the flat baking sheet.
Now as a disclaimer, when you attempt the oven method, you are aware of the risks involved. There are other methods, such as the dashboard of a hot car in the summer, using two pieces of playfield glass on a hot summer day, etc. Not all plastics are created equal. We attempted to use the oven on a really warped plastic from a 1966 EM pitch and bat. It didn't work. The plastic didn't flatten back down, it just got all bubbly and had some burn marks on it. But the plastic was so far gone before the oven we weren't too distraught and eventually made our own plastic.
But those plastics from 1966 and 1980 were probably totally different. Perhaps someone with more technical knowledge would be able to break down the different chemical makeup of plastics from the 60s vs plastics from the 80s. But if you're careful and watch closely, you shouldn't have any issues.
I hope this helps, and good luck.