runBMC: because cleaning the bearings is the same thing. However, I prefer to clean my tops without taking the tips out, just by immersing the lower part of the top (in part out of laziness, in part because in some tops it is not easy or you destroy the o-rings).
Pulp: your video tutorials are amazingly detailed. Wow! A great resource for the beginner.
On the BK you replaced the original o-ring with a piece of tubing, didn't you?