I made the arm that I needed to keep the ashtray latched and from opening too far tonight. It was alot of trial and error. The arm looks bad in the picture but with a bit of refining and once it's all black, I think it will look just fine.
If you look closely, you can see a magnet tucked under the corner of the hinge. That is what keeps it from coming open. I will need to get a smaller magnet though as that one partially covers a hole that I will need when I build the switch mounting plate.