Jason in Enid said:Donut said:Jason I haven’t looked at mine but the surface below where the strengthener rest may be different on the 6” and the 11 and 15”.
The strengthener slips down over both ears and slides down over the ears to the coil surface and the distance may be different from the pivot point to the surface of the 6” compared to the 11 and 15” coils.
Just guessing.
Doug
Interesting thought. I never bothered to measure the bolt hole distance off the face of the coil. But I can tell you for sure that the 6" model has a step that fits the coil and the 11/15" model is flat based.