I just saw this thread. Since I keg my beer, I dry hopped for the first time a little while back.
I took a different approach, I put the dry hop ball and hops in a sanatized keg with a lil distilled water
enough to cover the hop ball.....Then since the beer is a delicate pilsner and I don't want any O2 or light
problems, I carbonated the water/hop keg with CO2 after that got carbed, I then transferred keg to keg
the beer into the water+hop Keg. I have tasted one sample pull from this keg, and it seems nice so far.
It is still lagering for a couple more weeks.