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Just make some cuts with a dremel and soften the plastic with a heat gun so your limbs will push threw before hardening.
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YouTube
Just make some cuts with a dremel and soften the plastic with a heat gun so your limbs will push threw before hardening.
Attachment 349636
Could make a guide slightly bigger than pipe vs using a hinge with the correct profile. Then could use a dremel with an aggressive bit or an angle grinder.