I need to ream holes that will range between 3/16" and 1/4". The
actual size can vary due to the fact that what goes in the hole can
vary widely, but needs a proper fit. Right now, I'm drilling and then
filing with a small round file, but an adjustable reamer would really
be better. Just can't find any less that 8/A (1/4" +). I'm working
with plastics, so the material is not hard. Anyone have any
suggestions?

Thanks,
Bruno