Hopefully this isn't completely irrelevant, but I didn't know where else to post it. After reading some threads on here about using the Tokina 28-70mm f2.8 with the FS100, I finally decided to purchase one on eBay. Long story short, I've taken it apart and now the zoom ring gets stuck and the aperture ring doesn't work at all! Any ideas how to go about fixing it and maybe, in the end, finally declicking the aperture ring?