Body & Engine Parts Home / Timberwolf Diesel Chipper parts / Diesel TW190TDHB Parts / Body & Engine Parts / PSK2 - Piston & Spring Kit TW190/280 PSK2 - Piston & Spring Kit TW190/280 PSK2 - Piston & Spring Kit TW190/280 £11.75 Information PSK2 - Safety bar return piston & spring kit .Includes ; 1 x1601 piston & 1 x1603 spring . fits Timberwolf TW 190 & TW 280 models.