How do I make polymer clay necklace charms?

There are various "findings" you can use to attach something to a cord or to another finding (like your split ring). In the pic from your link you've circled an "eye screw'" but generally those are a little large and thick for most small pendants/charms/etc. You can find some tiny eye screws though in places where supplies for building dollhouses are sold (hobby shops) and maybe other places. Depending on what the "charm" or other dangle/bead/object is made from though, other "loops" can be used in the top for cording or for a jump ring or chain or split key ring, etc. ...Eye pins are often used, for example...those look like this and can be found at craft and bead supply stores: http://images.google.com/images?q=eye+pi... They are generally run through a hole in the dangle, or can be inserted into the top of it (like into polymer clay dangles or into anything which can be drilled to make a short hole to glue/etc the eye pin's shank into).

...Or "U" shapes can be glued into or pressed into the tops of some dangles. http://athousandcanes.files.wordpress.co... (the U shapes are made from colored plastic-covered wire in this case, into polymer clay, but you can see exactly which part I'm referring to because they're colored) ...Or something else can be attached to the charm that an attacher or cord could pass through like a "bail" --or a tube or something else. http://www.google.com/images?q=bails+jew... (bails...most are glue-on with a loop at top, but some are pinch-on, etc) ...Or the charm could be wrapped with wire leaving a place for the connection.

...Or the charm could be attached to a background or base or frame which itself has a hole or loop. You might want to check out some of the info on these pages for eye screws, eye pins, jump rings, bails, making your own bits, etc: http://glassattic.com/polymer/pendants_cording.htm > Loops & Holes For Cording.

I'm not sure what you mean. This is a key chain, you can purchase this at any craft store, complete with the key ring, the chain, and a ring to attach your lego to. There are findings out there that attach to the item itself, so you can put the ring from the key chain through it, available where they sell beads.

You might be looking for a bead cap with a loop to glue onto the top of your lego piece. Fire mountain gems has them, and you could make your own loop. There is also a loop that screws into the charm.

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