I'm using 18mm MDF as that's what I had laying around
1 x dimmer switch
1 x sewing machine motor
1 x old computer cable
2 x connector blocks
and a bunch of screws
Step 1: Rollers
If I had of thought about it a bit more I should have used round nails but hey too late now.
On one roller I need to form a indent for the drive band of the sewing machine motor to sit, this will stop it moving up and down the roller. to do this I used my drill as a make shift lathe, and just pleased a round file on the stick until the groove was at the right depth.