For the ashtray itself a great product is "Great Knobs" It is made by a guy who restores vintage fountain pens. He also has an MG TC. The product is great for bakelite or any hard rubber item, such as knobs and switches.
By the way, my ashtray is also missing the spring metal piece. If you find a stash of them please let me know!
Regards,
Sherman
http://pensburymanor.com/pensburymanor/Pensbury_Garage.htmlGREAT KNOBS!
Black Hard Rubber Color Restorer
Now you can bring back the deep black color and luster your black hard rubber dashboard knobs and switches once enjoyed when they were young and perky by using Pensbury Manor's GREAT KNOBS! to reblacken the oxidized, faded and browned out color that time and exposure to the elements has caused! GREAT KNOBS! uses the very coloring agent that was used when the knobs were originally made. Pensbury Manor's GREAT KNOBS! is a dye that penetrates the rubber surface pores and bonds with the original rubber in a most satisfactory way. It is a water based, black liquid dye that bonds with rubber but will not bond with the metal so clean up is a snap. The resulting restored color can be hand buffed to a very high sheen as you can see in the after picture below. GREAT KNOBS! comes in 1 and 2 oz. bottles - enough to restore from 25-50 normal size knobs and switches.
So simple to use! Just brush it on, let it dry and buff lightly and you’ll have some really GREAT KNOBS!
ALSO GREAT FOR BRAKE HANDLES, SHIFT KNOBS, DOOR HANDLES, HORN BUTTONS, BAKELITE ITEMS, MANY PLASTICS , VINYLS, PLUS MORE!