Does anyone know the correct thread size for the cocking bolt on the Benjamin Discovery?

I assume its the same as the Crosman models but the thread on the bolts was cut badly from the factory with
barely 2 full threads.

Having just put the guns together and cured all the leaks im not feeling the urge to take them apart again.

Neither the M4 0.7 or M4 0.75 dies match the thread.

Thanks