I have a whiring noise coming from the gearbox area when in neutral and the clutch is not depressed which stalls the engine when cold. It is a VHPD K-series, AP race clutch and 5 speed type 9 gearbox. After a little 'net surfing' some threads suggest a worn Spigot bush and others the thrust bearing. Other symptoms include clutch judder which is worse in reverse, notchy and stiff gears. Any thoughts?