"dave" wrote in message
. ..
I read somewhere on the web that your A&P can adjust your altimeter by
removing a pin or a screw that allows the barometric pressure to be set
independently from the altitude. Once it's set correctly, the pin or
screw is replaced.
Dave

Not legally. Adjustment of an altimeter in this manner is considered a
calibration. Calibration of instruments is considered a major repair and A&P
mechanics are prohibited from performing repairs (minor or major) to
instruments. In addition, the data correspondance between the altimeter and
encoder (if equipped) would be nullified and require retesting by an
appropriately-rated repair station.

Mike