I sometimes have my clasps come away from from the loop in my wire, because the jump ring seems to have just the slightest opening, no matter how tight I try to make it. What am I doing wrong?
You’re right, jump rings do have a small opening that wire can fit through. I typically attach the beading wire directly to the clasp without using a jump ring. If you want to use a removable ring, though, I would recommend using a split ring instead: it is more secure. Also consider wire guardians – these are small U-shaped metal pieces fit over the wire end to protect it where it’s attached to the clasp.