I am not sure what you mean with your question. Do you mean you have a arch shaped conduit or aluminium rod and want to re-use this frame for a heart? If so, please check out my comments on how to make a balloon heart.
If this doesn't answer your question, please explain in more detail what you want to do.
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I have checked some websites that were recommended by Balloon-Decoration-Guide.com in answers to some of the questions posted here. This was very helpful.