i used the edge of a screw driver, it worked quite well...
you dont have to get it perfect...
when you get to the bottom of the slot all the way around, you have it pretty much good...
but some silicone in there and your good...
dont be shy with the silicone either...
you no how much was in there to begin with...
so you have a pretty good idea of how much to add...
hope this helps...
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