These Cylinder Hold Down Nuts are an effective way to keep the cylinders in place when the heads are removed from the engine. This is particularly useful when installing the second cylinder over the piston and rings after the first cylinder has been installed, or when rotating the crankshaft for other work. In any case, even a slight rocking of the cylinder can damage the base gasket or cause a cylinder to lift entirely off the cases. These Hold Down Nuts have different threads on each end to accommodate either the Milwaukee Eight or the Twin Cam. With an MSRP of $71.50, you can’t go wrong. For more information please call us at (805) 482-6913, email us at email@example.com, or visit www.jimsusa.com.