After building Fredini's awesome turntable design (http://www.thingiverse.com/thing:28454), I had some minor issues with the two-part pulley he published. I took the single pulley design he posted and scaled it down for my Replicator 2 bed size. This scaling required me to also re-do the middle hole to match the motor stem size. Finally, I added a set screw hole, instead of trying to drill it out.