I have used a short piece snipped off of a square cross section elastic band for a spring. Cheap, easy to adjust, works well and one band should give a life time supply. The only negative I can see is the possibility of the rubber degrading over time. Perhaps an O-ring would be a better choice for spring rubber. And round too!
Powell >yesterday I fixed an A 50mm f1.4 lens with a sticky aperture. Now it works >fine again. Gee, the A pin took me 2 hours to get back in again. The >aperture click ball needs to be spring loaded. I lost the ball and spring in >an earlier attempt to fix the lens. I received a new ball and spring from >Pentax Netherlands, but the spring was way to long. I didn't see a way to >get it not jumping away before closing the lens. Also the ball seemed a bit >to large, it didn't fall into the hole where it should go. So I just put it >there without the spring, closed the lens and it works. I was worried that >the ball might go deeper into the hole thereby loosing the aperture click, >but it doesn't. > >Frank
