Hi Stoker,
That is an Odd Job to get called on to do. Museum related I presume?
Close enough; the job is for a company that makes exhibits for science centres. I don't know what they will be used for, I will be visiting the company in a couple of weeks and will ask. Some time ago I drilled about 20 snooker balls (all red; cheaper than the colours?) and mounted cut down shafts of dental mirrors in them. Turned out the balls were put in large holes drilled in some wood so they could be moved around to focus laser beams. They with lasers and other bits and pieces went to America.
Take care Tony.