It is very rare to suck all the solder at the first round (see Figure 17). You will need to repeat the process. You may need to solder the component again in order to mix new solder with the old one, facilitating the solder to be melted and sucked. Another tip is to move the terminal back and forth with a small flat-tip screwdriver, in order to lose the terminal from the hole.

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Figure 17: Terminals after the first desoldering round.

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Figure 18: Pushing the terminal forth with a small screwdriver.

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Figure 19: Pushing the terminal back with a small screwdriver.

Then you will need to repeat the process again until you see that the terminal is lose from the hole. In Figure 20, you can see both terminals at the end of the process. Pay attention on how the terminals are centered and there is no solder holding the terminals to the holes.

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Figure 20: Terminals after the desoldering process.