OK, here's the info they gave me. If you can't tell, I have NOT looked into this any further than keeping the printout they gave me. Which are for something called Thrust Sheets from SwiftSprings.com.
Description: "Thrust sheets provide a variety of benefits for coilover systems. As a spring becomes compressed the coils attempt to distribute the energy by unwinding. This is called twisted force. The unwinding makes the spring rate irregular. By allowing the spring to smoothly rotate around the perch during compression, the spring rate will return to normal. Thrust sheets also help dampening and rebound of struts too. Thrust sheets bearing action allowing rotation of the spring allow the load on the spring to be more evenly distributed which reduces lateral shock shaft load. Increased lateral load on shock shafts cause a reduction in the struts ability to rely on valves for dampening force.
Thrust sheets works with all brand of coilover system & springs as long as the inside diameter matches. Each kit comes with 4 composite rings and 4 stainless steel sheets that will cover 2 coilover springs. " Inner diameters listed are 60mm, 65mm and 70mm.
Anyone else here heard of these and if they would "solve" for this "problem"? OP, have you called TC Kline?
Just a girl and her 863 ponies...
2013 Santorini M3, 2016 328i Alpine White Wagon (Lab hauler), 199x Sapphire M3 (because racecar)
///M-Flight Western US Regional Manager