I'm running the GC coilovers on Koni yellows, with the gc cambewr plates. What I did was remove the spring perches completely from the struts by cutting them off in the lathe, then cut the weld down to a perfect flat edge in the lathe so that my sleeves slide over and seat perfectly over the welds. There is no way I would try and grind those welds down by hand...it would be impossible to get them even all the way around.