Fixing a Manual Focus Lens Diaphragm (with a rubber band)

A year ago I purchased an old and cheap 28mm F2.8  manual focus lens to use it in macro-photography and with an old Minolta; Its diaphragm did not functioning properly, closing slowly and with uneven blades, or even not closing at all.

I dismantled it trying to fix that problem, as you can se in the first steps, but I didn't success because the spring was inside a block.

Months ago, I realized how to repair it... with a rubber band; I did it, and It is still working today.

I hope this may be usefull.

Thanks for your time!

Step 1 Opening the Lens:

You must retire these three silver philips screws. Pull the top and look at the second pic

hey! you can see the little pics if you becames member; it is free, and fast; do it!

Then unscrew that little black screw in the aperture ring, and pull it up while it is in the more closed aperture. Do the same with the third ring and its very little black screw below the first one.