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----- Original Message ----- 
From: "George Brock-Nannestad" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 20, 2008 2:31 PM
Subject: Re: [ARSCLIST] ET help!


> From: Patent Tactics, George Brock-Nannestad
>
>> I recently did a job where I was able to create tracking through with
>> plastic clay.
>>
>> Steve Smolian
>
> ----- wow! Was that a lacquer record? The layer is awfully thin. My main 
> use
> of plastic clay has been to exclude oxygen on cracks cemented with cyano-
> acrylate (shellac-base record), because it can be removed from the grooves
> afterwards without damaging them.
>
> Kind regards,
>
>
> George
>
>>
>> ----- Original Message ----- 
>> From: "George Brock-Nannestad" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Wednesday, August 20, 2008 12:16 PM
>> Subject: Re: [ARSCLIST] ET help!
>>
>>
>> > From: Patent Tactics, George Brock-Nannestad
>> >
>> > Matt Sohn recalled:
>> >
>> >
>> >> >> I've a pretty good hand at transferring ETs, but the
>> >> >> cracks in the lacquer
>> >> >> make this one a real challenge.  Is there any way of
>> >> >> restoring these
>> >> >> grooves?  I thought of prying off some of the lacquer in
>> >> >> chunks to glue back
>> >> >> in place, but I'm not sure the grooves would line up even
>> >> >> then.
>> >>
>> >>
>> >> I recall talking to someone a long time ago who said he used
>> >> clear nail polish to fill in the cracks. I don't remember
>> >> who it was or how exactly he did it, or what possible damage
>> >> to the disc might result from such a procedure, but I
>> >> thought I'd pass it along..
>> >
>> > ----- I would not recommend nail polish. While the softening agent is
>> nice
>> > and makes for a tough coat, the solvents are the same as for cellulose
>> > nitrate - because nail polish is mostly cellulose nitrate! This means
>> that
>> > you would eat into the edges of the lacquer layer. This makes for 
>> > better
>> > bonding but also rounded curves. And you still have to cut a groove to
>> > carry
>> > the stylus from where it leaves lacquer to the correct place at the 
>> > other
>> > end
>> > of the gap. And, as I said, nail polish is tough!
>> >
>> > I have had good results with waxes (low-melting micro-waxes). BUT, 
>> > waxes
>> > usually implies heating and applying it in liquid form. On an aluminum
>> > base
>> > the heat of solidification will be distributed to other areas, causing
>> > differential heating, and who knows what damage that might cause. On 
>> > glass
>> > it
>> > is safer. Using a solvent for the wax that is not also a solvent for 
>> > the
>> > cellulose nitrate (paraffin would work for some waxes) would permit
>> > application of the liquid and then wait for the solvent to evaporate.
>> You
>> > need to cut grooves under the microscope to connect correctly, but that
>> is
>> > simple - the worst crack I have come across was 3.5 millimeters 
>> > (narrowing
>> > to
>> > zero over 40 mm, and a ruler to support the scriber was quite 
>> > sufficient.
>> > And
>> > the wax is very easy to cut.
>> >
>> > But you have to remember that the shrunken lacquer also has a shrunken
>> > time-
>> > base, so it is not just a question of removing the clicks of silence, 
>> > but
>> > of
>> > stretching time, perhaps 5%, perhaps less, of the sound you do obtain.
>> >
>> > Again, like Eric said, it takes experience, and whose lacquer record is
>> to
>> > suffer?
>> >
>> > Kind regards,
>> >
>> >
>> > George
>> >
>