This is the mod I had to do to the ashtray to replace the spring and retainer that I had to cut off to clear the underside of the Double Din unit.
It consists of a magnetic cabinet latch that pushes the ashtray open enough to grab it and pull it out by hand, it also holds the ashtray in place when closed.
The steel washer that the magnet attracts is levelled with epoxy and screwed in position. There is a piece of Gorilla tape stuck to the magnet to reduce the strong magnetic attraction to the washer.
The ABS plastic base is attached to the ashtray using acetone which gave the strongest bond to the parts.

This mod is best described in this YouTube video made by a member turboomni08, CLICK