THE GUIDE MARK
The balance is at the guide mark when the regulating organ is at rest and the impulse pin (roller jewel) is perfectly positioned on the line of centers: escape wheel – pallets (lever) – balance. This position is an essential criterion for the proper operation of the escapement, since the dead point of the pallets (lever) must coincide with this alignment for the rest and impulse phases to follow one another correctly.
The adjustment of the guide mark depends on the construction of the movement. On a watch equipped with a stud holder movement, this adjustment is simply carried out by rotating the stud carrier, which moves the outer attachment of the hairspring (balance spring). In the absence of this device, the Horologist (watchmaker) must proceed differently: he adjusts the Guide mark by turning the collet, the part that carries the inner attachment of the hairspring on the balance Axis.
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