RE: Reference and Conversion Chart
Thanks for the effort on this.

I still have the two charts that hung above my fathers lathe for 40+ years,
now probably 70-80 years old.  Fraction size, decimal conversions on one.
 And the other for common threads, drill number size for tap or clearance.
And number drill size to fraction.  But no metric 'stuff'.  When these were
printed metric was only used by the enemy!