Despite the name and looks, don’t expect the alien horde to wave these around when they come for Earth. This $310 oddball is designed to spread CV joint boots wide enough to slip the narrow end over the bearings to save time. I can’t say I’ve ever met anyone without the patience to remove the joint’s circlips to install the boot, so this is probably a production-only or very specialized tool. It seems to use an adjustable air supply to apply enough torque to spread the boot, but I can’t be sure since I’ve never used one.
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