I recently got a bunch of new rosettes from Wade over at Mandala Rose Works http://www.mandalaroseworks.com/site/home that are setup for the MDF rose engine with appropriate phasing holes and slots for the hold down screws. He has two sets of rosettes. I got set 1. He makes them out of 1/4” acrylic and are laser cut. I made a couple of 1/4” washers to go between the main pulley and the rosette to keep the spacing the same as the 1/2” rosettes. So far, I am very pleased with the performance. Give them a try.