COMPACT Auto-Rewind Spool rubber band - FIXED inner hole system

Project for COMPACT spool rewinding, using elastic. Fitting with a specific inner size system with internal diameters fixed for a specific coil and tensioning springs. The structure has an 8mm through hole for fixing. it can be mounted vertically or horizontally with the possibility of rewinding up to 70cm.
interposing the appropriate thicknesses adapts to spools of any width.
The central thickness is fitted with 4 m3 bolts to which the other components are then fixed as shown in the attached