KEF NT25 SP1276 tweeter, how to reshape voice coil?

I am about to replace the ferrofluid in my KEF NT25 SP1276 tweeters from my 103/4 SP3131 speakers. Whilst taking them apart one of the voice coils got slightly knocked. How can I ensure the voice coil is round? I have gently rolled a Q-Tip around the coil, it looks a lot better but not perfect.

ideas?
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