To be honest the lapidary clubs are not a great place to find lapidary skills in most cases. It is a sad fact that most skilled lapidary people are vastly more experienced than club members. I am an expert with vibe tumbling and often find that people are not really clear about expectations. An overly conservative approach is always called for in these cases. The person may be happy with what was called the California polish 40 years ago which was a not perfectly prepared ( sanded) stone with a high gloss polish over residual imperfections. This actually approximates much of the 19th century agate work seen in Europe. I would have someone at the club repolish the beads and not resand them and call it good. Very few people are good at re drilling and those who are expect decent compensation so the " rehabilitation " of these beads could be expensive. The last person who came to me for redrilling expected it to cost them less than one dollar per bead. I still laugh about that event.

In general terms I would not try to redrill a bead to enlarge the perforation. This causes breakage—particularly in crystalline minerals, like amethyst. Agate can be tougher.

But my approach, when it is needed, is to abrade the perforation. I use a jewlery saw mounted with very fine blades, or with abrasive line. It is arduous work. But if you have to do it, it is possible.

Jamey

I told this gal that quartz was not an easy stone to deal with, that re-drilling required patience, skill, and a lot of lubricant - a bead reamer was not a good option.

She replied that she hadn't had any response from contacting local rock clubs. Judging from what what you've relayed, she was in luck, LOL!

She decided to just live with the bead being as clean as she's been able to get it, and to quit obsessing about it.

Some clubs have very skilled members but most are people looking to use group machines. Repairing gemstones of any type is a thankless business that most experienced people avoid.

,,,on a gem bead with a sharp crooked hole...