i just made one- look for it on icmag under vwfringe or on youtube, mine only lasted an hour or so, but the idea holds and saved some time
i clamped a rotary tool to a piece of wood with a conduit clamp, and i used a thin stiff piece of steel instead of a thick wire (out of a windshield wiper refill)
i tried a drill but it didn't go fast enough really
the "blade" tends to bend upwards but not quickly
i should have used:
a better quality motor,
denser bud - hehe,
a narrower-slotted "screen,"
two conduit clamps instead of only one (and rohs compliant bushing material instead of steel wool),
a wider plank of wood to separate the clamps and hold it in place better,
and something else i'm forgetting atm
[video=youtube;jn2H1ERRUsY]http://www.youtube.com/watch?v=jn2H1ERRUsY[/video]