the pipe rams 4 are then retracted and the stroking tool 8 is pulled into the lubricator with pulling tool 9 and plug 10 the sequence to retrieve the lower plug would be the same as the one used for the upper plug a stroking mandrel of different length might be used to properly space out the grabbed section in the stroking tool and the lower plug the operational sequence to install a crown plug would essentially be the same of the one used to remove a plug but performed in different order the stroking tool 8 with setting tool 9 attached to it plug 10 attached to setting tool 9 and dynamic seal is lowered into the lubricator 6 valve bop 3 and 5 have been open and pipe rams 4 have been open as well the toolstring is lowered into the tree and stopped in a position where the pipe rams 4 can grab the stroking tool 8 in an appropriate section the pipe rams 4 are activated and grab the stroking tool 8 the stroking tool 8 is extended until the plug 10 is set in its seat once the plug 10 is fully set the setting tool 9 automatically releases from the plug 10 the stroking mechanism is reversed moving the setting tool away from the plug the pipe rams 4 are retracted releasing the stroking tool 8 the stroking tool 8 is pulled up into the lubricator 6 with pulling tool 9 the stroking tool 8 in retracted position is lowered until plug 10 lands on top of its seating position the pipe rams 4 are activated and.