Instructables

Step 9:

Now we need a way to keep the LED from shaking all over the place inside the signal body. All I had on hand was some cardboard, but i'm going to go back and use some heavy duty rubber, and glue it all in. I just needed something temporary. For now, you get the picture.

Whatever you choose though, it needs to fit snug inside the space the bulb use to take up.
 
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