http://www.cloyes.com/HighPerformance/Products/Accessories/tabid/185/language/en-US/Default.aspx One side goes into the timing chain which buts up against the cam and has three bolts holding it in. The washers for the timing chain overlap the hole by just enough to secure a cam button (it has a grove cut into it for this).
The button itself has a roller mechanism, so the tip is designed to hit the stock timing cover and be locked down. The part hitting the cover shouldn't turn, but the roller allows the cam to turn normally but won't let it move front to back (the back is locked in by the rear cam plug).
The issue was I had nothing for the button to hit with the glenwood mounts.
The cloyes button comes with a hard washer to weld to the cover if you have issues, need additional length, clearance, etc. My plan was to run without that washer and cut the .700 aluminum stop until I had the proper clearance. Later, if it looked like the aluminum was getting worn - then secure the washer to the end for the cam to hit (obviously cutting the .700 diam part). This is why I actually made the stop longer than it needed to be - just in case I needed to do this.
My Milodon gear drive has only an aluminum bump like what I made, and they last a long time.
