I dissed the Strong trim back when I built the Cozy and installed a Cessna style elevator trim system with a cable loop between the IP and the F22 bulkhead. Beyond the advantage that is can never run away or lock up because of the clutch (very simple) system, I could incorporate the servo from the Century A/P I had at the time. Now the servo works with the Trio A/P for trim.
Since this has worked so well for +20 years now, I wanted something as simple for the LongEZ project. The principle is the same only I am using a small geared motor (from Amazon, where else?) the leaf spring from the elevator torque tube attaches to any of the two cable / spring joints: This first pic is the leaf spring setup in the Cozy. Two other are the new LEZ system
SImple and compact, eh?
You might try making a new nut out of aluminum. That worked for me. See my article about Strong Pitch trim in CSA Newsletter last Fall (September or October, I think).