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The mandatory retrofit is not the $1,000 unit. It is a replacement of the

nose wheel fork and the

GM -? (looks like the head of wood golf club) on the factory supplied nose

gear assy.The latest GM?

is made of steel. If you have it you have the mandatory replacement. The

$1,000 assy. is an option

that replaces the 235 nose gear assy with a semi-hydraulic one like the

320s have. Many (most?) 235s

were converted to the later assy, because the original would shimmy

violently, if the nose wheel

touched before the mains, on landing and the pivot wasn't adjusted right or

had oil on it. This

shimmy often broke the nose gear and /or the motor mount. Many planes

including mine still use the

original style nose gear. You just have to hold the plane off till the

mains touch.

Bill N7WB