Prostar heads valve seal question

Find a piece of pipe or tubing that fits over the seal and does not touch the spring and lightly tap it on with a hammer. It should go flush, more important to have it straight on the stem than flush.
I used to use a 12 point socket.
I think the seal sitting square on the guide matters and all the way flush with the top of the guide, doesn'thave to hit the bottom. In a far out scenario retainers smacking seals isnt good for anything involved. Plain and simple...crooked is lame. Aka I agree except for the flush part, or I would have hit the green button.
As for seal style.. being that we have some chiming in, I'd like to know if they are saying that is a better seal and why they believe that if so.