I saved info from Mica about all the tool sizes needed for Alembic instruments. I will paste it below for reference, it says to use a 5/16" nut driver for the Q-switches, nothing about tpi which would seem to be necessary to know in buying a replacement.... hope that is helpful.
For general adjustments:
truss rods: 1/4" wrench
nut height: 5/64" hex driver
bridge height: 5/64" hex driver
intonation: 7/64" hex driver, ball end recommended
intonation for concealed hardware guitar bridges after 2010: 3/32" hex driver
hat knob: 1/16" hex driver
pickup selector/CVQ knob: .050" hex driver
collet knobs: 6mm nut driver or blade screwdriver
springless pickup height: #0 phillips screwdriver (Xcelite P12SV)
note: several Xcelite #1 will fit, other makers' #1 may not
spring-mounted pickup height: 3/32"
trimpots: 1/8" blade screwdriver (Xcelite R181V)
These tools would only be needed for repairs:
pots: 1/2" nut driver
stereo jack: 12mm nut driver
Q-switches: 5/16" nut driver
note: Xcelite and Snap-On make hollow shaft type that work best
rotary switch: 5/16" or 3/8" nut driver
bridge aircraft fasteners: 5/32"
Gotoh bass tuners: 15mm
Schaller bass tuners: 13mm
Gotoh or Schaller guitar tuner: 10mm
(Message edited by mica on February 16, 2011)