Tektronix 402x terminal keyboard enclosure -- 0.188" hex set screw?

[legalize]

See http://bitsavers.trailing-edge.com/...2832-00_4027_Service_Manual_Vol_2_Jan1980.pdf page 291 and following.

I have a Tektronix 4024 terminal and the keyboard enclosure is similar to the 4027 keyboard. There are 4 tiny hexagonal set screws along the back of the keyboard enclosure that allow you to open up the enclosure. The 4027 parts listing gives this description for the set screws:

SETSCREW:4-40 X 0.188 INCH,HEX SOC STL

Manufacturer info:

HOLO-KROME CO., 31 BROOK ST. WEST, HARTFORD, CT 06110

Does anyone know what the right size hex wrench is for removing these without stripping the innards?

Thanks.

 

[legalize]

OK, the small hex driver in the "iFix It" kit took care of it.