We sold
uncored beads made with 3/16" mandrels and they fit just fine over Pandora, Chamilia, Biaggi, Troll, etc. We recently bought Jim Moore's bead press but had to wait on the silver tubing which was out of stock at the time.
We finally received the tubing from Santa Fe Jeweler's Supply
http://www.sfjssantafe.com/SmetalsIt...+Tubing&r=type
#118200 silver tubing - has a 5.03mm OD and a 4.3mm ID 26 GA
This tube fit perfectly over the ends of all the bracelets we have here (Pandora, Chamilia, Biaggi). However, we found that beads made with 3/16" mandrels wouldn't fit over the tubing by just a hair. We use a very thin bead release and had to go back to double dipping in a thicker release.
That solved the problem because we really didn't want to go with 1/4" mandrels. Our customers didn't want bead holes that large, which made the beads larger than their regular bracelet beads when mixed together. We had to make the beads quite a bit thinner to better match the smaller holed beads when using the 1/4" mandrels. Hope this helps!