it is a tiger drive and it spins the same direction as a mach. I put one on a wasp .28 the drive is smaller so I used some of my older tools I have, cut up a allen wrench can't remimber the size now , and a 1/8' drive socket ( here's the had part) I had a 1/8" drive (square) by hex I ground all sides of the hex down to fit the losi starter motor heat shrinked it altogether. and I have a stater motor that works on 3 diff. engines very conveniant.