Vintage Yankee Handyman 233H Unusual BIt, 1/4 Hex, Flt Hd. Driver, Phillips Tip

Description

Yankee Handyman Model 233H with an assortment of bits.
(4) flat head tips. One is Yankee3512. One is numbered 331. Other 2 are unmarked and as shown.
(1) Phillips Head unmarked. Black finish.
(1) 1/4 hex driver adapter spring ball retainer.
(1) Slot Head Screw Driver with spring loaded Collar as shown.
(1) Marked "Yankee" 5/64H.
(1) Unknown Long Driver with offset flattened section and special slotted head as shown.
Not known. Was recovered from tools owned by a music instrument machinist that contained many piano tools. My best guess is that this was custom made for removing and installing tuning pegs into the piano frame. The flat section was probably there to allow the bit to later be used as a hand tool.