Zoegrant, are you referring to the bolts that attach the pressure plate TO the flywheel? If so, then mechanic58 is dead on.
The picture Tim shows appears to be what attaches the flywheel TO the crank. although the same design may very well have been used on the pressure plate also.
My flywheel (on a 51 3100) did have the two-hole lock plates on it that Tim referenced, which I will go back with. But we have used external tooth lock washers, and red Loctite, many times on these.
Mike
