I've only gotten a few hours to work with the holiday, but I have one corner done. After cleaning out the strut tubes really well, it looks like there is misalignment of the upper section above the weld and the lower section below the weld. Perhaps the guy who I bought my coilovers from used a shock smaller than a koni to line them up for welding. Using the sanding drum with an extension (thanks for all the recommendations above) that I bought from Lowes, and my drill motor, I concentrated on the junction of the strut, especially the side that seemed to be pushed in. Working for a couple of hours, the koni slipped in a little, then grind more, then the strut goes a little deeper, grind more, then finally it went all the way in. To get a stuck strut out, I put a nut and washer on the strut rod and then put an open end wrench under it and "tap" with a dead blow hammer until it started moving. I reused the tubular spacer that I made for my tokicos, plus a handful of flat washers to fine-tune the spacing and it was done! Now to do the same thing 3 more times....