Jims Machine JM-5809 Cylinder Hold Down Nuts Tool for use on Twin Cam 99-17/Milwaukee-Eight Touring 17-Up/Softail 18-UpDescription for JIMS Cylinder Hold Down Nuts 5809 Use on the new Milwaukee Eight series engine and Twin Cam 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. It is also advantageous to have the cylinders secured when rotating the crankshaft for other