A fluid dispensing apparatus is described, the operation of which involves installation thereinto of a single-use fluid dispenser cartridge. A secondary intermediate formed article is obtained by piercing a preliminary hole in the primary intermediate formed article such that a radial thickness of a prospective cam top part is larger than a radial thickness of a prospective cam base part, and by forming a positioning part. The compositions are preferably made by reaction of poly with multifunctional alcohols. The target carrier assembly according to the invention allows this inclination to be set according to the desired application. As the knob element is translated around the user interface element, a change in the size of the user interface element can occur that is at least in part based on amount of rotational distance.