attaching aperture scales to copal no 1 shutter

I am at the final step of mounting a G claron 210 onto a shutter. I've bought the aperture scales from schnieder, but now wonder how to attach them. There are holes for tiny screws on the shutter body at at each end of the scales, but I don't know what size they are. To be honest, I'm not that confident of being able to use them, I can barely see the holes & dont look forward to working throuh a loupe. Anyone else had this problem? Are there alternative methods of attaching in them, prefferably easy!

Contact cement! Double back tape! Charlie............

I've never found out how to get hold of the miniscule screws the shutter manufacturers love so much.

Maybe an old-fashioned watchmaker might help? One of those who learned watch repair when it was all cogwheels and counterweights, I mean...

Being a woodworker, I'd make a frame for the scale out of 1"x2" black walnut. Or, perhaps basswood to cut down on the weight.

The advantage of using a lens-repair pro (e.g. Flutot, Grimes, et al) is that they usually have a supply of those dinky screws.

Can you jst order the aperture scales directly from Schneider? If so, what do they cost?

Thanks

Don.

I removed one screw to measure it. With a inch micrometer, the diameter is 0.052 inch, which is 1.32 mm. I used a screw pitch gauge to measure the threads, but this was very difficult because of the very short length of the screw and the fineness of the threads. I think the pitch is 0.30 mm. On the web, I find that 1.4 mm diameter x 0.30 pitch is a standard metric thread. These are probably the dimensions. Actual screw diameters are normally under nominal, so this would agree with my measurement. The length is 1.5 mm.

Reinserting the screw was fairly easy. Arrange the shutter so that the screw hole faces up. Use one finger to hold the scale in place against its springiness. Use tweezers to place the screw into the hole, then screw into place.

Work in a way so that if you drop the screw you can find it. Maybe in a box.

Even on my several year old lens, the scale had a lot of spring to a larger diameter. Contact cement might let go after awhile.

Memo to my self - glue and shutters don't go together!

I decided to glue the scales to the shutter (they are on thin metal), using a pin to register the hole in the scale with the screw hole on the shutter. The bottom one went in fine. But the top one......


4 hours later I just about managed to scrape all the glue out of the internal workings of the shutter. Everything seems to run OK and the timings look alright. But I never want to have to do that again!

I've decided to scan it (oops, can I say that here), print it out and selotape it to the shutter. I can always replace a bit of tape and paper if it gets grubby. anything has got to be easier than un-glueing a shutter mechanism. I did say I used super-glue didn't I?

Donsta said:

Can you jst order the aperture scales directly from Schneider? If so, what do they cost?

Thanks

Don.

Click to expand...

I need an apature scale for my 240 G-claron in copal. Where did you get yous? John

Exactly the reason I recommended Contact cement or double back tape.
A tiny amount is applied to the scale and the area you want to glue it to, let it dry then carefully align it where you want it and press. Kind of funny when you think about it, super glue in a shutter!. A tiny drop of super glue applied to the scale ends would have worked just fine. Sorry you had so much trouble, most contact cements clean up very nicely with WD40 and a rag.
Charlie