i think i have found a way to finish installing my strut cartridge installation without the GM tool Dave sent me.
i'll have to rent the Checker tool again but only to remove the old passenger side strut cartridge and install the new KYB strut cartridge (the driver's side KYB strut cartridge is already installed - just not the boot/jounce bumper or strut mount). that's where i ran into my problem with the Checker tool - the 'leverage bar' that you use to get the strut shaft centered so you can install the boot/jounce bumper & strut mount does not work with the KYB strut shaft due to the KYB strut having a different thread pitch. since i have no way of centering the strut shaft, i can't install the rest of the stuff.
as for the 'leverage bar' issue - i am going to try something else. it will require no special tools, but i'll need my brother's help and i'll need to raise the front end a little with a jack to relieve some of the spring pressure. this will take most of the side load off the strut shaft so i can grab the strut shaft and push it upwards while centering it (i'll be doing this from the wheel well reaching in between the spring coils) while my brother pushes the strut boot/jounce bumper onto the shaft and then pushes the strut mount down into place. then i can put the strut shaft nut on, lower the car back down and tighten the strut shaft nut to spec and be done with it....or at least i hope!
not exacty the right way to do it and probably not the safest, but it is
extremely important that i be in Virginia by Thanksgiving Day. the tool Dave sent me probably won't arrive here until the day before Thanksgiving

really sorry about this Dave, i will make it up to you!!!!!! i would just wait for the tool but i
must be in VA for Thanksgiving.
i'm going to try finishing the job tomarrow so i'll let you know if it works.