Lee Epperson’s article is wonderful. There was a warning from some
gentleman about using the flexshaft on opal or other heat sensitive
stones. I know many opal carvers who use the flexshaft–myself
included. Foredom makes a clear plastic guard to fit over the
handpiece. Opal carvers fit the guard with plastic tubing and attach
a gravity flow drip bag (like those used in hospitals) works great
and no heat build-up.
Vi Jones in the great Pacific Northwest. rpcks1x1vi.george (at)