Fender Mounted Turn Signal Indicator Help

[gilgalad1138]

So I need to replace the bulbs in the indicators because they're not lighting up, getting power, but no blinky blinky. So my question is, how do they come apart? I don't wanna break them trying to figure it out..
72 Swinger.

 

[GMachineDartGT]

If you are sure they are grounding properly, the bulb number #330.

At the end of the wire, the barrel has female threads and unscrews from the base with the bulb inside. If they are original. its a delicate operation. I broke down a bought a new set from BE/A.

 

[gilgalad1138]

They're definitely original. Are the threads on the barrel just normal right hand threads? Anything else I have to watch out for?