2007 iMac had a Defective HDD. Had to replace it and new how, just needed the tools to avoid costly repair bill
The repair went smoothly. I have experience working with these units.
I was surprised to find that a Kit for fixing iMac's (noted by the fact it was one of your only kits with large enough suction cups) came with a screwdriver, but not the right bits for an iMac. iMac's use almost entirely small hex and torx screws, and these screwdrivers are hard enough to find as it is.