No more seat squeaks!
My seat backs would squeak when driving with each change in road surface. A little detective work showed that under the load of my big posterior, the seat-back spring-arm was just slightly rubbing against the spring case. With normal play in the seat, it would squeak while driving.
I took them apart, cleaned and re-lubed them with no success. Then I tried adding a brass shim to move the arm away from the case, while better, this did not completely solve the problem.
Attached are pics of the final solution. I used some 0.020" thick teflon sheet to prevent the spring from rubbing on the housing. (Probably not neccesary, but I had it apart anyway, so why not). I made a spacer for the arm out of 1/16" teflon sheet for the spring-arm that prevents metal-to-metal contact. (This is what actually fixed the problem).
It's mostly invisible, but now that I know it works, I plan to re-make spring arm piece from 1/16" thick black delrin, that won't show at all.