Started again on the eccentric straps after a brief spell due to tendons in the wrist made any work virtually impossible. A couple of cortisone injections and the pain vanished.
An idea from my experience. Make the straps first, and then turn the eccentric disks to fit while on the lathe. I had to "tickle" the slot depth a bit until the strap turned smoothly around. I also marked each strap to its eccentric.
After the eccentric is parted off it's a bit difficult to adjust.
Glad the pain is fixed. Nothing worse than machining in pain.