I am considering buying a Fretless Carvin AC-40 but can't find one to try out. Carvin says the action at the 24th fret is 5/64 inch, which is about 2 mm, which is about 5 business cards. Can anyone with a Carvin fretless AC-40 please tell me what the action is at the nut? You can measure it by seeing how many business cards stacked up will fit between the fret board and the bottom of the E string at the nut. (One business card thickness is about 0.4 mm or 1/64 inch). Thanks.