Some frustration! The redcat aluminum pull start engine cover does not work as designed using the stock pull start cover internal parts. It's puzzling why Redcat designed it the way they did instead of making a straight forward bolt on copy of the stock one. Although I have no clue how they could have possibly done it, I'm still wondering how they did it. I have hard time believing that they would design, mass produce a part and sell it when it simply doesn't work. If any one can shine in that would be great. I manage to make it work, but it took buying and mixing up some foreign parts. Now only time will tell if it actually works reliably.