I think theres a slight confusion not looking for 5mm stroke on a DD that would seem like it would wobble a bit maybe okay for mag work. I am looking for a 5mm stroke for armature rotarys such as Nicks,Stealth,Storm etc. Administrator your right about the bearing not fitting every machine right now I have a 5mm bearing from friction that I have had to modify somewhat for it to work properly but now its my favorite machine for any line work. Thanks for all the replies looks like I just need another Mini Cranker that will open up to that stroke.