Review on ATD Tools 7549 Spring Compressor by Andy Mitts

I'm having a lot of trouble getting this to work on my '67 Ford Ranchero coil springs. It flexes and doesn't fully compress the spring. Likewise; The hooks don't go through the hole properly without buckling. I hate doing this, but I think I'll have to take the Cadillac out of the garage, use a grinder, and cut out the springs. If anyone could give me some advice I would certainly be grateful.