I like to drive it down to the Top of the Boss. I use a big round flat seal driver. I lightly tap on the seal until it begins to drive in true. Then I give it harder smacks until it is flush with the rim. You can see the lower exit hole for the Drift Pin. No sealent on these little seals. They are above the level of fluid anyway. Make sure you utilize a "Digital Hammer" to whack it into place!
