Here are some examples of recast.
This method is actually quite simple and most of you may already know.So I will try to summaries everything and keep it short.
First,make a casing and fill it halfway with epoxy putty.
Secondly,apply a small amount of baby powder onto the putty and spread it well,this will prevent the piece from sticking onto the putty.Then press down the piece halfway down into the epoxy putty.
Thirdly,apply some more baby powder and press down some more epoxy putty so that it will cover the piece.
Wait until putty have cured,and you have your mold.
Remove the top of the mold and the piece inside.Fill a big piece of epoxy putty into the gaps and using the top mold,gently press it down.(Note:Always apply baby powder to the mold before recast,this would prevent the putty from sicking to the mold.)
Wait for it to cure.Remove the recast and after some sanding,the piece will be good to go.