Leica Builder T User Manual page 173

On the tribrach
step-by-step
Check & Adjust
Step Description
1. Level up the instrument with the electronic level, assuming that the elec-
tronic level is correctly adjusted. Refer to "5.2 Instrument Setup" for more
information. Then remove it from the tribrach.
2. The bubble of the tribrach must be centered. If it extends beyond the
circle, use the adjusting pin in conjunction with the two cross headed
adjustment screws to centre it.
After the adjustment, no screw shall be loose.
Builder 173