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I've also found this method to be quite useful in about 75% of the
problems I've seen.  I've dealt with both DJ TT and the Esoterics which
both offered the direct drive disconnect so the passage can be backed up.
 I've never actually tried playing a platter in reverse to dig out the
grooves.  Maybe I'll try it then next time I'm having a black mass.
I have tried to use magnifying glasses and what not to actually look into
the groove and see if I can see anything obvious and I almost never can.
I've seen various photos of a small section of groove taken with a
microscope, but I've never seen a passage that skips by microscopic
photo.  I for one would be really interested to see what the actual
surface looks like.  Is it debris that causes the needle to jump out of
the groove onto the land and slide to the next groove over or is there an
actually groove that cuts across the land and make a new groove across
the land that acts as a "shorter path to ground", so to speak?  Anyone
know where such a picture might be found?  Thanks.  Randy

> Date:    Mon, 24 May 2004 09:31:53 -0400
> From:    Aaron Luis Levinson <[log in to unmask]>
> Subject: Re: Groove Damage--was: Highly unorthodox cleaning methods
> for LP'...
>
> Yes this direction reversal one of the best removal techniques I've
> encountered as well.
> However, I would like to point out that you do not want to do this
> often if you are using a standard needle and cartridge. The
> orientation
> of the standard needle is designed for clockwise rotation only.
>
> In order to do this procedure with the best possible tools I
> strongly
> suggest that folks purchase a two-way DJ cartridge for this
> application.
> Excellent one are made by Shure and Ortofon that are explicitly
> two-way
> systems. Secondarily, if you can get your hands on a modern DJ
> turntable
> they can run in reverse as well(Technics 1200 Mk V I think) this
> machine
> has tremendous torque and when run in reverse it will pop a little
> piece
> of schmutz out of a LP groove like you cannot believe.
>