At 01:55 AM 9/16/2001 -0400, you wrote:
>I wrote about my wholly unreliable OM-2 (not n), Shoe 3, T-32 combination.
>
>Thanks for the response. How do *you* clean the contacts? In particular,
>in my post, I asked how do you clean the shoe-to-body socket on top of the
>pentaprism.
Jim:
The standard method is to use something like the synthetic rubber erasers on
the ends of pencils, or drafting erasers. You'd probably have to whittle down
an end to get it to fit into the small contact area. Then rotate and try the
connection out.
For a higher-tech solution, 3M Corp. makes a variety of abrasive sheets with
abrasive fineness down to about 0.5 micron (about 9000x, enough to polish a
surface almost to mirror-like smoothness, and certainly good for cleaning
oxidation surfaces). Used with a light touch, these can remove all of the
oxidation and virtually none of the underlying metal. In Canada (where I
live), you can get these sheets for a couple of dollars. Great for sharpening
knives to a surgeon's edge, too! ;-) I've used these sheets to deal with
tough polishing jobs on sterling silver that's too heavily oxidized for any of
the usual solutions to work well. In addition, you could also try honing
compound on the end of a thin dowel, but you'd have to clean out what remained
of the compound (it's usually compounded with wax, which can be
attacked/cleaned with methanol).
Here's one source I know of for the superfine abrasive sheets, Lee Valley Tools
(a Canadian company):
http://www.leevalley.com/home/main.asp
Look up item #54K95.01 or #54K95.02.
Garth
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