GG, 
 My take on the MF No. 4 is that it never had a "chuck" it simply accepted a
drill bit with a base the size of the socket on the drill and the keeper nut was
made to clamp on the bit where it tapered. Using the same bits you used in a
push-drill. I have only ever seen one type of bit in a No. 4 and it was just a
pointed bit with no cutting flutes or anything. I also have another drill that
is the same as a No. 4 but is not a MF and it is the same. JMTC...
back under the porch...

roy griggs
roygriggs@c...