To add a handle for better grip of the fresh air vents I drilled a 4mm hole and used two spark plug caps. These are the caps we remove from the Rotax NGK DCPR8E spark plugs. They have an internal 4 x .07 thread. Drill a 4 mm (3/16) hole. Use a 4mm bolt and cut off the non-threaded portion is the easiest way to make a short piece of all thread. The rest is self-explanatory from the pics.