Hi Deb.

I am not sure how familiar you are with forklift operation.

If you are really only trying to help others then maybe I can be of assistance to you.

Firstly is this " Strain " only on the left shoulder and is there any possibility that it is really Neck related ?!!!.

Think about that and then I will give you some "Possible" leads.

I say that because if operators were driving properly I think, like the other respondents, that the shoulder strain is unlikely to be related to the " Spinner " which should be held Palm down and despite your obvious technical knowledge does not materially increase muscle strain ( in some cases it could decrease it ) That will depend on the positioning the wheel, seat and foot pedals.!!!!

Please accept I am not trying to doubt your obvious knowledge on this matter.

Rgds