Very nice clean install. I'm using the same stopper you have and have not experienced any problems with it. I would suggest that you either change the mounts in favor of stand-offs or check the mounts every time you fly the plane. In particular, look at the internal corners on the mount. That is where the cracks will appear when they start to fail. Where and when did you buy your engine BTW? It appears you have the older style that I have. The new ones being shipped have thicker ears on the rear case and come with stand-offs.