Peg Dope - Cello

The strings of a cello (or any other string instrument) are held in tune because of the tension on the peg going into the peg box. When the pegs do not fit tightly into the peg box the strings can slip causing the instrument to go out of tune. This is particularly a problem on newer instruments. Fortunately the solution is very easy. Peg Dope (also known as peg paste or peg compound) is a product that can be applied to the tip of the peg to create additional friction and stop strings from slipping.

Peg Dope is typically sold in either a small stick (resembling lipstick), a block (like rosin), or as a liquid in a bottle. It serves two different, almost conflicting purposes. It lubricates the peg shaft so it turns easily in the pegbox, and provides friction to keep the pegs from slipping with the force of string tension. When pegs slip, tuning can become virtually impossible. Afflicted cellos can be tuned, but within minutes the instrument can be out of tune again. When pegs stick, tuning is very difficult or impossible. In between these extremes, one may find pegs that tend to slip unless firmly seated, or that do not turn smoothly, alternately sticking and turning. Well fitted pegs, properly doped, turn smoothly and hold firmly as the player wishes.

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