I have been trying to sparge with this Phil's sparge contraption that spins as the HL is passing through it. It works pretty well, and I have hit efficiencies in the low to mid 70's
Something that's bothered me though is that is squeaks for like an hour when I am sparging. I've tried cleaning it real well, and even attempted to put a little drop of olive oil on the "spindle" about which the horizontal sparge arm rotates. It never worked for more than a few minutes.
So this time I used some graphite and a little bit of silicone spray. Just like with the olive oil, it bagan squeaking again about 2-3 minutes into the sparge. Maybe it's just that I'm a real auditory person and little noises are my pet peeve, but that really angered me. I gave it a solid 5 second blast of WD-40, and it immedately went quiet. However, not 5 minutes later, it started AGAIN...
Anyway, I've given up on the dang sparge arm, but now my wort smells kind of funny, and doesn't seem to want to ferment properly.