Grasski are sold with one of two types of bindings. Models Race and YoungStars are equipped with so called screw bindings. For assembly you will need screwdriver and key number 8.
Models Endurance and Endurance Speed are using so called "hook" bindings. For assembly is not needed any tools and changing of binding length takes only few moments.
Endurance & Endurance Speed binding
Following pictures and video is assembly guide for Endurance & Endurance Speed models.
Video guide for binding assembly
Video guide for binding unassembly or binding change