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On my latest rebuild, mandated from an airborn boom strike, I decided to us the dampers from HeliDirect for the HDX 450. The are stiffer one-piecers and fit well into the MX aluminum head. Also, they come with cool little spacers! I have only done a few test flights, but everything seems right. P/N is a Sonix HDX450-S07. Maybe they are a 1.60 alternative to Trueblood items. Comments are welcome on alternatives to stiffen the damping for flips and rolls.