Wanted: (NOT COX) OS Max FP, Magnum & Thunder Tiger GP .40 Back Covers

Hello Dennis, the OS MAX-S .35 backplate is not interchangeable with the FP.40 . The FP .35 and FP .40 use the same case. The LA.40, the FP.40, the Tower .40, and the Magnum GP.40 I know are interchangeable. Curtiss Shipp is a fellow on Stuka Stunt who cnc's backplates for the above engines I mentioned.He charges about $13 plus shipping. His backplates are top notch which utilizes a 0-ring groove to seal it. The FP .40 and Tower .40 uses a gasket. The OS LA series uses a plastic backplate and has no gasket. The OS MAX-S .35 from the 70's is totally different. I was recently in search of gaskets for the MAX-S in which I had to have custom cut by a laser cutter. I wasn't able to use the gasket from a FP.40 due to size and also hole spacing being diffferent.

The metal backplates are long out of production for the OS FP.40. Tower Hobbies has sold out of them now for nearly 5 years. I have 3 of them here still in the packaging and I wouldn't part with any of them for less than $15 a piece plus shipping. Ken