Just to clarify for myself. The one I bought from dale came with why u believe a 12v motor but he also sent me a 6v motor. 12 I used at about 2.8volts and it was sputtering when I changed angles so I replaced with the other (yellow back). 6v? For lining, I used the first motor around 3.1 and was very happy. Where should I use the new motor? I know this sounds confusing, but any rw users out there might get it? I was also part of the rotaryworks group buy and still haven't used that guy because the tube to cam is so far.