M42 to EF adapter with flange to push down the aperture pin.

If you happen to own a lens like Helios 44-4M that has an auto-aperture pin, but doesn't have auto-manual switch, you will want something to push down the pin when adapted. You could use tape, you could possibly use a M42x1 threaded shim I also posted, or you could just print an adapter that has an added flange. It may or may not need some extra material at the bottom, but I think it worked. My Tilt-o-matic is fitted with the non-remixed adapter and a shim, but I gave one away to a friend with this one.