This is an experimental choke tube and choke tube mounting plate for tanked .049 Cox engines,. I designed this off of a Cox Babe Bee engine. The point of this is to allow you to have a choke tube on your tanked Cox .049 engine, allowing you to shut off the engine or add a throttle. This is a test peice currently and after testing it I will make changes if needed and post the final version. First remove the 4 screws on the back of your engine. Next, leaving all of the engine's parts just as they were, place the choke tube plate against the tank backplate with the ridge facing the tank backplate (in the air intake grove). After that insert the screws back through the screw hole, holding on the choke tube plate. Then insert the short end of the choke tube into the back of the choke tube plate with the long end facing up. Now you are done!!!