Just a thought - Could you not use a light dumbbell or small weight disc if the machine friction is too much.
Doing a light weight for a few more reps may help with getting some blood in the area before doing
Forced / assisted reps.
Or as Vince says maybe try working them indirectly
Injuries are the worst to deal with & work around - Very Frustrating
It's not really an injury per se but it is a result of an injury. I tore the rotator cuff but the tendon retracted into the joint on both shoulders and could not be reattached. So part of the muscle is unable to function.
And yes, I do thoroughly warm up the area starting with performing various shoulder movements with no weights at all before moving to the 2.5 lb plate and the 5 pounders but that I need to assist. I don't have an issue with the first 45 degrees with the lateral raise or any angle. It's after that as I start to get to shoulder level that strength drops off considerably. So if I use a weight that I can get to shoulder level it would be way too light in the beginning part of the movement as to be worthless. So I use a weight that is challenging for the first 45 degrees of motion and then assists myself the rest of the way and try to fight the negative portion of the movement as much as I can.