On gloss:

terpebji'o in sense "of a pen"
x1 is the nib/application-tip (for using) pen x2 and applying ink x3
trofalpenbi in sense "Fountain Pen Nib" on place 3
x1 is a fountain pen using ink x2 and having nib x3

On affix form:

nibli
x1 logically necessitates/entails/implies action/event/state x2 under rules/logic system x3.

In definition:

terpebji'oganborcisni
x1 is a pen tip/nib with thickness/width x2; x2 is the kulmusim/width of the tip of pen/quill x1

In notes:

sampinsi
x1 is a digital stylus for use on surface/device x2