Been searching for a year and a half now after buying a set of robart 810's only to find out they strip gears as fast as i could power them up. Sent back, then upon build for the top flite, there's no way they will even fit after assurance from robart themselves. Any how, lesson learned. Mitch from down and locked has been working on getting his design rotators out with some production problems not foreseen (business, stuff) I'm holding out for these and keeping fingers crossed. Latest word from them was release early 2019.