. If you are making a prawn and adding legs afterwards, you could add 'prongs' for the legs when you are focussing heat on that area. You can then come back and heat that leg prong and add to it. It makes it less necessary to reheat the entire area and also, by starting heating the prong, you are allowing heat to gradually go back into the main body so are less likely to thermal shock.
That's how Lucio Bubaco works his figures in soft glass. The prongs are called avolio, I think that's how it's spelt.http://www.luciobubacco.com/public/gallery.html