Canon IIIa shutter material?

I haven't. I've used fabric from an old film changing bag with good results. It's very thin, which makes it a little harder to handle than thicker material, but the thinness works in your favor in a tight space like a Leica or Canon rangefinder.
 
That's an interesting idea, might have to see if I can find one around here and measure to see how thick it is.
 
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