I have to use a flip mirror with my DSI on a 80mm to do so I have to remove nosepiece from DSI and screw into flip, my issue is that the UV/IR filter I use cannot screw into threads on opposite end of flip mirror. Does anyone know if I need a adapter to fit it it is a Baader 1 1/4" filter I am wondering if diameter is 49mm and the flip is 48mm. Please help 
