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[john wilton]

I'm embarassed, but I can't figure out how to loosen the infinity stops. The screws are set deep inside the stops. They have no slot to accept a screwdriver. There are tiny central holes in the tops of the screws but they are round (not hex for an allen wrench).

The secondary mirror on my Vue-focus (the tiny one on a stalk mounted coaxial with the viewfinder) has tarnished so that the RF spot is brown and a bit hard to see. I tried gently wiping it with distilled water, this neither improved or worsened the situation. (The large primary mirror is bright and clean and not the problem). I imagine resilvering (if possible) would be very expensive. A replacement stalk with good silvering would presumably be hard to find. If all else fails, would it be out of line to consider crazy-glueing a tiny rectangle of first-surface mirror to the stalk?

[Les]

Either they WERE hex screws and somebody has been messing with them or they could be spline head screws Kalart used a spline head screw to lock the the interior arm to the transmission shaft. A bright flash light and a mirror may allow both the light and your eyes to be in the proper place.

Spline screws & wrenches (they look like allen head wrenches) are used in refrigeration industry and may also be available through micro-tools or small parts.com
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"In order to invent, you need a good imagination and a lot of junk" Thomas Edison

[john wilton]

Hi Les, very hard to see or photograph, but easier to see in a photo. Sure enough they are hex, hopefully in good enough shape they'll take a wrench. Presumably an American (not metric) size?

[Les]

yeah I'd bet they're hillbilly Americun.
_________________
"In order to invent, you need a good imagination and a lot of junk" Thomas Edison

[graphicdave]

If you look closely at the pictures, you can see the sides where the tool would enter the set screws. They don't look like they have been butchered. I believe if you can clean the gunk from them you can get the proper tool in there to loosen them.

[aoresteen]

For the record the infinity stop screw size is a hex size 0.050 inch SAE