I am working on the 4* 40 kit and I copied off of the plans to determine where to mark the thrust line onto the F-1. I need to know where to place the engine mount on that line, do I line it up with where the engine sits on the mount or do I line it up with the center of the mount. The mount they sent is about 1/2 inch taller than what they show on the plans is this just because the old aluminum mounts are shorter than the new glass filled ones or do I have the wrong one? If you can help I would appreciate it.