Hi Benjasilva, I have measured this set some 40yrs. ago in 1978. I trust not a lot will have changed since then. The 'flea-hole' under the left index finger had a short piece of ball pen refill inserted protruding quite far across the bore allmost ending in the thumbhole. I made and sold a working copy in boxwood and cowhorn using these plans (key beeing Bb/Eb I seem to remember). The making involved a lot of tedious handwork like filing and planing. If you get a chance much better to buy one as…