how to lengthen action figure's arm?

how to lengthen action figure's arm?
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Custom WorkstationI'm currently working on finishing up ladydevimon custom action figure. The base figure is Wasp from ML But I'm having one problem is that I don't know how to lengthen the arm. Can somebody give me some recommendations. thanks
Ladydevimon image:


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Posted by
Strangecustoms123 on Tuesday, June 16, 2020 - Updated on Tuesday, June 16, 2020
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Thor on eBay
Insert a connecting rod
Sculpt over
Voila