Does any one know the name of the bolt washer thingy-ma-jigs what stop the manifolds bolts from coming loose? I remember something about nizpro selling them but they cost a fortune, My uncle was a pilot and said they use something similar to these on planes shaped like a triangle and stop the bolt unwinding ? Any help would be great because old mate who just bought a turbo ute has lost 2 bolts from the previous owner and the rest are finger tight.