Put a drop of super glue on the knot.

It’s important to use the right tool and the right crimps. We recommend the sterling silver and the gold-filled crimp tubes for the best results. A specialized bead crimping tool is the best to use.

Here is a link from our Learning Center on how to use a crimp tool:

http://www.artbeads.com/howtousecrto.html

For more information about this question please visit our blog:

http://blog.artbeads.com/category/ask-bailey-beader

There are no special techniques for knotting different hole sizes however you could consider using bead caps which may be used to cover up part of your bead due to an imperfection, or a larger hole. Oftentimes, the bead cap is used to "dress up" a bead, crystal, stone, or other type of bead adding a touch of elegance to your bead.  To view our selection of bead caps, please follow the link below:
http://www.artbeads.com/silver-components-bead-caps.html

I generally use 28 gauge as this is the easiest for me to work. But, I have used other gauges, depending on the project. It takes a little more effort to crochet using something heavier, but it can be done. I did a cuff bracelet and a pendant using 26 gauge and they turned out fine, but you don't have as much control over the wire.

Depends. . . . .if you have an undrilled rivoli stone, for example, they make special settings where you can glue the stone into, and the setting has either 1 or 2 loops from which you can hang it.
If you have wire wrapping skills, you can wrap certain gemstones, and include a loop in the wire for hanging.
Some pendants can be glued with epoxy to a bail for hanging.

Most likly you have already figured this out but I will answer yes jump rings should hold up as long as the piece is not worn on a continious basis

I personally use a basic jewelry bonded glue or in some cases crazy glue. Using the tip of a toothpick or the tip of a stright pin I apply a dot of glue on to the opened area. Of course this is done after I have gotten the ring to close to the point that each end is touching. The glue holds the ends together and prevents me from having to make the ugly side by side end closing. Another trick that i use on larger rings or when the charm is particually heavy is to apply the glue then cover the cloded endings with a 3mm crimp cover. I have found that this works well and gives the item a unique look.
Hope this has helped, sorry it took so long to answer.

If crimped properly, the crimp bead should hold just fine. You do not need to add any glue. If you not already doing so, you may want to consider using the Clam Shell Bead Tip with 2 Rings for extra security regarding the clamshell loops. The two rings are soldered shut and cannot accidentally be opened when yanked on or snagged. You can find this bead tip via the following link:

http://www.artbeads.com/ss-bdtip3.html

Since a ring will not fit through the chain links, you can use a crimp end at each end of the necklace, such as the Sterling Silver 1.2mm Fancy Crimp End (http://www.artbeads.com/ss-crend01.html). You will need to measure the width of your chain to make sure that the hole will accommodate the chain size. You will then thread the chain into the tube, making sure that the loop at the top is not blocked, and will use a pair of chain nose pliers to flatten the middle section of the tube. You can attach your clasp to the loop on the crimp end with an open jump ring.

To use the 1-Hour Two-Part Epoxy, you will mix an adequate amount of both cartridges together prior to applying. The epoxy will be relatively thick, and you can apply the epoxy with a small plastic knife or clean popsicle stick. If you are applying the epoxy to a small surface, we would recommend applying the epoxy with a toothpick for more accurate detail work. The epoxy does recommend letting the items sit for 24 hours before being completely cured. Please allow ample time to cure.