Now for something serious.

Grumpyoldman said
I have a form of Parkinsons. In my situation it is the trembling and sometimes lack of equilibrium. I am building a 318 for my grandson. Somedays I can get one bolts or one nut installed and I am done for the day. I had o get a new torque wrench that was not "click type" because somewhere in trying to apply steady even pull on the wrench the trembling will start and the wrench click and I am nowhere near needed torque or way the hell over. May take me a year but I will get it done.

I worked with a guy that had a bad tremor, not only his hands but his head as well. He drove hwy tractor without any problems. It was similar to Parkinsons as well. Maybe the same as you have. He said he was looking into brain surgery to correct or improve it.