As the seasons change, many forum users will suffer stuck pegs as the wood in the pegbox expands as it absorbs moisture from higher air humidity.  A solution was offered by the maker of the Rezx Resonance Modulator (a magnetic wolf tone eliminator).

Place desiccant packets in plastic bag and then place bag over the peg box.  Use hands to deflate bag and secure bag to neck with masking tape, avoiding contact of tape on strings and wood.  Wait several hours (or over night).  As moisture is lost in wood, it will shrink and therefore release the peg.  Once peg is loose, remove bag and allow pegbox to expand.  Retighten peg.

He then offered a novel technique to regenerate the desiccant.

Place desiccant on flat tray and place in microwave oven with a glass of ice cubes.  Stop oven as ice cubes begin to melt and replace with fresh ice cubes.  After this is done 4 or 5 times, the desiccant should have change color (if of the indicating type) and is available for reuse.  Store in sealed glass container.

The water molecules in ice are greatly expanded and act as a trap (or getter) for the water released from the desiccant, as it is differentially heated by microwaves.