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I have strong, pushy fingers. A dental tool helped. Steve ----- 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 >> > >