Hi, I am currently working on a project in which i want to add the mechanism provided in video. 

It's a belt driven plate on a linear guide (v-slot). 

I already added the AL-extrusions and the steel plate with the v-wheels, mated everything and it's moving fine but I cant figure out how to add the open ended belt and keep the movement for a motion study later. 
I tried adding belt between the two pulleys but it's a closed belt, and to design the belt it will be fixed.

here's the mechanism : https://youtu.be/hSoTG09ibOM