Description

Molded wheel having a diameter of 13cm consisting 4 grooves of different diameters which are in the ratios 1,3,5 and 7.The wide and flat bottomed grooves ensures and exact diameter for each groove, and to retain the cord each groove is having a small hole. To minimize the mass and inertia the back of the wheel is hollow and is attached to a rod which is 14cm in length.