Pegs: Pegs sometimes stick and are hard to turn. Sometimes all it
takes is a little peg compound to help free them up. This compound
has a similar consistency as a waxed crayon. A little bit goes a long
way. Pegs can sometimes slip as well. Especially during the winter
months. Pegs are ebony and the peg box (scroll) is maple. They
dehydrate at different rates during the winter because of their
composition. Sometimes, a little inward pressure with your fingers
as you tune will help alleviate this problem.
Bridges: Bridges can sometimes lean forward after constant tuning.
The pressure from the string can bring the bridge towards a improper
position. Slightly release the tension on the strings and pull the bridge
into the proper position of near perpendicular with a slight lean
towards the tailpiece of the instrument. This is if the feet of
your bridge were cut correctly.
Tuning: When bringing the instrument to pitch, slightly loosen the
string and bring the instrument UP to pitch. This will help you
from breaking strings and the string will stay in pitch when performed
in this manner.
Hope this helps, please feel free to contact me should you need help
with any of these or different problems that you may have.