as per below ,, use thread lock on them as well and clean treads with brake cleaner first,,
remember each cap is only going to fit one rod and one direction,, i always run my finger nail down the edges where the join together and if can feel any lip then its wrong as they when fitted and first stage of torques will be invisible to feel and sight ie any jointThanks Mike.
I managed to fit 2 pistons in but no cap yet as I didn't know the torque settings.
Cheers