What exactly does a cast tailpiece accomplish as opposed to a stamped one? I think I read somewhere that they increase the sustain. Is that correct? I noticed on the Allens that they have only one set of hooks for the "little" strings and not the sideways which makes two sets. I don't know what those are called, hooks like on my standard Kentucky tailpiece. When I changed strings last I used only one set where the tension was pulled directly forward and one of the E strings came unwound. I kind of rewound it and used both sets of hooks and it worked fine. I saw on a changing string video that you can use only one set and all will be fine, but not so. Does anyone make a tailpiece with both sets? I don't think you could rewind one and pull directly forward and it would stay wound. Any ideas other than keeping the stock tailpiece?