In brief
Not every parking brake uses the same trigger.
Useful to know
The sting transmits mechanical action to the parking brake in the systems that use it. HELLA specifies different options according to the vehicle and braking performance. [1]
Before ordering, specify the country, length and accession, and whether the system actually has such a sting. The words "electric manual" do not automatically describe the same mechanism for all models. If the retention is uneven, it is an occasion to check all the related mechanics, not a ground for arbitrary tensioning of the regulation.
Sources
For further detail and to check the information: