the interrupter is pretty self explanatory once you get it taken apart the interrupter actually presses in from the back of the camshaft sprocket and is held in there by a plastic clip which is part of the magnet assemby you might actually want to use some epoxy because you will find it isn't held in there very tight at all which will cause a lot of wear on the plastic piece over time and this is not a job you want to do more than once