It falls off. Doesn't stay "attached". I can't see any residue of a glue or adhesive. It doest "snap in". Not sure what protocol is to get it affixed to the steering wheel.
No, the inside of the wheel has a tube that the steering wheel fits over. The horn button has or had plastic tabs that held it in place and a spring that rubbed the inside of the tube which was the ground. Some of my horn buttons were so tight I sliced of small pieces with an exacto knife. This could be your problem. An easy fix would be take the button off and get some plactic epoxy and add it to the areas that were originally to hold the button in. An easier fix would be put some electrical tape where those tabs rub. BTW an original Dino with the silver surround is about 300$ plus in new condition. Rob
My sollution was to add a sleeve (metal). It's springing action will keep the horn cap in place. The diameter of the sleeve will depend on the space you have between the body of the horn cap and opening diameter int he steering wheel. If you have limited space use a metal spacer in three points to keep it centric. I hope this helps.
Some of the horn button housings had a metal "o ring" which nestled on the inside surface of the tabs which exerted outward pressure on the tabs to insure a friction fit onto the steering wheel mounting hub. Is the metal ring there? Many times the fit was so snug people removed the metal ring. If missing replace the ring. Need to see a photo of the button housing backside to confirm if it had a ring, . Another way to remedy is to purchase a new horn button and switch the center emblem into the new . Be gentle as the old trim rings are metal and the retaining tabs are fragile. Cal