An engine 3 wherein the second portion comprises a thinner annular extension of the first portion and an annular retainer keyed to the annular extension thereby allowing relative axial motion while preventing relative rotational motion, the annular load sensing element being retained for {HEAD ~ axial loading} between the annular retainer and {TAIL ~ the first portion} with the annular extension and the annular retainer reducing torsional load on the annular load sensing element 
An engine 3 wherein the second portion comprises a thinner annular extension of the first portion and an annular retainer keyed to the annular extension thereby allowing relative axial motion while preventing relative rotational motion , the annular load sensing element being retained for { HEAD ~ axial loading } between the annular retainer and { TAIL ~ the first portion } with the annular extension and the annular retainer reducing torsional load on the annular load sensing element
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